Former Wimbledon finalist Bouchard was playing for the first time since the WTA Tour was shut down amid the coronavirus pandemic, but the weather prevented a number of her contemporaries from taking to the court.
The wildcard Canadian - now ranked 330th - was a 6-0 6-3 victor over eighth seed Veronika Kudermetova.
Reflecting on her return to action, Bouchard said: "It's hard to know what to expect. I haven't played a real match since January.
"I've played a couple of exhibitions, which helped a lot, but it's still different, it's not a real tournament. I didn't set any expectations.
"I'm so grateful to have a job and to have this opportunity. You appreciate things more when they're taken away from you."
"I didn't know what to expect in terms of my level. I played better than I expected. I just wanted to be there mentally, no matter what."
Kristyna Pliskova had already played at last week's Palermo Open but was frustrated in her efforts to get past 15-year-old WTA debutant Linda Fruhvirtova on Monday.
The match was twice stopped due to a thunderstorm, with the second heavy downpour leading to the suspension of play for the day.
That meant no action for third seed Elise Mertens and Jasmine Paolini, who each lost to Aliaksandra Sasnovich in Italy.
Meanwhile, Dayana Yastremska and Daria Kasatkina withdrew from the tournament due to dental and hamstring issues respectively.
Simona Halep was belatedly set to make her WTA comeback on Tuesday.
She told WTA Insider: "Honestly, I don't really know how to manage now the comeback.
"The good thing is that everyone is in the same position. I was not injured and forced to stay away from tennis. Everyone is in the same position and now we will see who is going to manage the comeback better.
"I feel like I have the experience to deal with it and, if I take it relaxed and give my best every match, I'm pretty sure that soon I will touch the level again.
"But I'm also sure I will struggle a little bit because my style and my type of personality is to keep playing matches and always I needed matches to find the rhythm.
"Now it's different. So I cannot complain but I also cannot be happy. It's in the middle."
Forthcoming tournaments in Stuttgart, Istanbul and Prague will not take place as planned.
The latest cancellations follow those of the Indian Wells Open, Charleston Open and Miami Open in the United States, along with events in Bogota and Guadalajara.
The tour will make a decision on the status of its remaining European clay court tournaments later this week.
A WTA statement said: "Due to the ongoing global coronavirus outbreak, the WTA tournaments in Stuttgart, Istanbul and Prague will not be held as scheduled.
"We regret this is the case for all of our loyal fans, players, sponsors and all those who support women's professional tennis.
"At this point in time, the WTA Tour is now suspended until May 2. We will make a decision in the week ahead regarding the remaining WTA European clay court events and will continue to monitor this situation closely and its impact on the 2020 WTA Tour season."
Making her fourth appearance in a WTA Tour-level final, Bouzkova ended her wait for a maiden title with a convincing 6-0 6-3 success on Sunday.
Bouzkova, ranked 66th in the world heading into her home tournament, wrapped up the first set in under 30 minutes.
Potapova hit back with two breaks in the second, but an overhit forehand down the line from the Russian handed Bouzkova the trophy in her second final of 2022.
"I just want to thank everyone, it's just a dream for me to win my first title here at home, I couldn't be happier," said Bouzkova, the fifth Czech to win on home soil since the event debuted on the WTA Tour in 2015, after Karolina Pliskova, Lucie Safarova, Petra Kvitova and Barbora Krejcikova.
"I felt your support, even those who aren't here, it's a dream come true, playing in front of a home crowd. My first winner's speech, I'm sorry it's not the best!"
Bouzkova, 24, has now won both of her matches against Potapova, after defeating the 21-year-old in qualifying for the Miami Open earlier this year.
The in-form second seed has six titles to her name this season; three of which have come alongside Siniakova in doubles events.
Together, they have triumphed at Roland Garros – adding to Krejcikova’s singles success – as well as in Madrid and the Gippsland Trophy.
However, this was their first singles meeting at Tour level, which went with the form book as Krejcikova claimed her 18th win in 19 matches after comfortably prevailing 6-3 6-0.
The home favourite, who is still to drop a set in the Czech capital, will play Wang Xinyu in the semi-finals after the world number 147 beat Grace Min 6-3 6-3.
Garcia defeated Swiatek in three sets on Friday, ending the world number one's 18-match winning streak on clay.
Paolini should have provided a far more straightforward task, and so it proved, as Garcia raced through 6-1 6-2 to make the title match.
The fifth seed will now face first-time WTA Tour finalist Ana Bogdan – a 7-5 7-5 victor against Kateryna Baindl – in that Warsaw decider.
Garcia will hope for better conditions for the showpiece, with rain having added another factor on Saturday, when the in-form French star was still recovering from stopping Swiatek.
"It's been a challenging week, especially today, with the big win yesterday, only a couple of hours to recover and be ready," Garcia explained.
"Conditions were very difficult, a lot of rain. I'm just very happy with the way I played, and I stayed very focused on the present, and it paid off."
At the Prague Open, Anastasia Potapova will face Marie Bouzkova in the final, the seventh seed playing the eighth seed.
Potapova had it largely her own way against Wang Qiang, who succumbed to a second-set bagel in going down 6-3 6-0, while Bouzkova also won in two but needed a tie-break in the opener against Linda Noskova, progressing 7-6 (7-4) 6-3.
Potapova faces a busy Sunday, as she had already advanced to the doubles final alongside partner Yana Sizikova.
The world number two, who won the Dubai Duty Free Tennis Championships in February before the WTA Tour's suspension for the coronavirus pandemic, sealed a 6-2 7-5 victory on Sunday.
A very different story looked set to unfold after Mertens won the first two games, but Halep clicked into top gear to reel off six on the bounce and take the set.
When Halep continued her streak by breaking in the first game of the second set, the writing appeared to be on the wall for Mertens.
But the Belgian, chasing a sixth singles title, hit back immediately to keep her hopes alive.
Ultimately, however, the class of two-time grand slam winner Halep told and the Romanian will soon have to confirm whether she will seek to cash in on this form by competing at the US Open, which has suffered from a spate of withdrawals over COVID-19 fears.
Top seed Halep, playing her first tournament since the resumption of the season, took less than an hour to wrap up a crushing 6-2 6-0 victory.
The two-time grand slam champion came through three-set contests with Polona Hercog and Barbora Krejcikova en route to the last eight, but had no such trouble in a one-sided quarter-final.
Halep broke three times in each set as lucky loser Frech, playing her sixth match of the week, was blown away by the Wimbledon champion.
The world number two, yet to confirm if she will play in the upcoming US Open, said: "The whole game was better today.
"I'm happy that I can play better and better day by day. It was a good one and I'll take it."
Halep will either face fellow Romanian Irina-Camelia Begu or Sara Sorribes Tormo for a place in the final, with the latter having taken the first set of their quarter-final before play was suspended due to rain.
Third seed Elise Mertens earlier overcame wildcard Eugenie Bouchard 6-4 1-6 6-4 and will take on Kristyna Pliskova, who advanced when Ana Bogdan retired due to injury when leading 5-2 in the first set.
In her first professional match in almost half a year, world number two Halep, who skipped last week's Palermo Open and will not make a decision on whether to play the US Open or not until after the tournament in the Czech Republic, was made to work hard for victory by the unseeded Hercog.
The Romanian picked up an early break and responded to dropping her serve in game three of the first by reeling off the next four in succession to take the set.
When Halep started the second set by breaking Hercog the writing appeared to be on the wall, but the Slovenian world number 46 fought back valiantly to force a decider in emphatic fashion.
Halep was unable to convert any of the six match points that came her way after breaking for a 5-3 lead, with Hercog clinging on to take the match to a third-set tie-break.
After failing to consolidate an opening mini-break, Hercog's resistance was finally broken after two hours and five minutes when a forehand into the net sent top seed Halep into the second round.
Wildcard Barbora Krejcikova ensured Halep's next match would not be an all-Romanian affair by beating Patricia Maria Tig 6-4 6-3.
Second seed Petra Martic defeated Varvara Gracheva 7-6 (7-2) 6-3 and third seed Elise Mertens needed three sets to overcome Jasmine Paolini 7-5 4-6 6-3.
A number of other seeded players were not as successful. Ekaterina Alexandrova (5) fell to qualifier Lesia Tsurenko, while Anastasia Pavlyuchenkova (6) went down 7-5 6-2 to Arantxa Rus, and Anastasija Sevastova (9) lost 6-2 6-2 to Irina-Camelia Begu.
World number two Halep claimed a 7-6 (7-2) 6-3 victory in the Czech capital and has the chance to extend her winning streak to nine matches having won the Dubai Duty Free Tennis Championships in February before the WTA Tour's suspension for the coronavirus pandemic.
Begu deserves immense credit, though, having spent seven hours on court over her first three matches and having to conclude a three-set quarter-final triumph over Sara Sorribes Tormo earlier in the day with rain having delayed the match.
"I didn't play my best tennis but also she was tired, so in my opinion, it was a good match," Halep said in her on-court interview.
"I'm really happy that I could win it. It's always tough to play against her. She's a great player."
Awaiting in Sunday's final is third seed Elise Mertens, who defeated former finalist Kristyna Pliskova 7-5 7-6 (7-4) in the day's earlier last-four contest.
Neither player was particularly convincing in the early stages, with each of the first four games going against serve, but it was Krejcikova who settled quicker to take the first set 6-3.
She then brought the second set back to 5-5 after being 5-2 down, but Halep managed to see it out to level the match, before going on to seal the 3-6 7-5 6-2 win in the decider.
Top-seed Halep will face Poland's Magdalena Frech – ranked 174 in the world – in the quarter-finals after she saw off Arantxa Rus 6-3 2-6 6-4.
The day began with what turned out to be a gruelling encounter between Eugenie Bouchard and Tamara Zidansek, but the Canadian – who is attempting to climb back up the rankings after slipping to 330 – prevailed to reach her second WTA quarter-final of the year, winning 7-6 (7-2) 6-7 (2-7) 6-2 in two hours, 56 minutes.
Sara Sorribes Tormo had no such difficulty against Laura Siegemund as she emerged 6-2 6-3 victor, but she will have to wait until Friday to find out her next opponent after Irina-Camelia's meeting with Leonie Kung was suspended due to poor light.
Kung had just won the first set 7-6 (7-3).
The world number one succumbed to a 6-1 1-6 6-4 defeat to the fifth seed, who ended the French Open champion's 18-match winning streak on the dirt.
It was Garcia's first win over a top-ranked player and sent her into a semi-final against Jasmine Paolini after the Italian came from behind to beat Viktorija Golubic 1-6 6-2 6-2.
Swiatek said: "Maybe I wasn't as disciplined as in previous tournaments, but I'm happy. I felt like my brain didn't intuitively predict where the ball would go, but I'm still learning, right?
"The first two sets depended on her – whether or not she would be in control. At the end of the second she lost control and took advantage.
"In the third set, she got back to her game. But if I had a better first serve percentage, maybe it would have been different.
"I don't know what decision I will make next year. Maybe longer preparation [on clay] will be necessarily, or maybe I'll give up this tournament. We'll see."
Kateryna Baindl became the first lucky loser to reach a WTA Tour semi-final this year by overcoming Petra Martic 1-6 6-3 6-4. Next up for Baindl is Ana Bogdan, who beat Laura Pigossi 6-1 6-1.
World number two Anett Kontaveit was also on the receiving end of an upset, going down 6-1 6-1 to Anastasia Potapova in 49 minutes at the Prague Open.
Potapova will take on qualifier Wang Qiang for a place in the final, with Czech pair Marie Bouzkova and Linda Noskova – only the second female player born after 2004 to reach the last four of a WTA Tour tournament – in action on the other side of the draw.
Defeated in the final of the Hamburg European Open last weekend, Kontaveit got straight back to winning ways in rapid time with a 6-0 6-1 win over Ekaterine Gorgodze.
The world number two got 81.8 per cent of her first serves in, with the overwhelmed Gorgodze only able to win nine returning points across the entire match.
Up next for Kontaveit is Lucie Havlickova after the Czech defeated compatriot Barbora Palicova 6-2 7-6 (7-5).
Fourth seed Cirstea was sent packing from the first round by 19-year-old qualifier Oksana Selekhmeteva, whose 7-5 6-4 success was her first in the main draw of a WTA Tour event.
Dominika Salkova marked her WTA main-draw debut with a 6-1 6-4 win over Ylena In-Albon, while Barbora Krejcikova delighted the home crowd with her 6-3 6-1 triumph against Anna Blinkova.
Due to persistent rain, only three matches were completed at the Warsaw Open on Tuesday.
Clara Burel, Ana Bogdan and Jasmine Paolini all advanced to the second round with wins over Anna-Karolina Schmiedlova, Nuria Parrizas-Diaz and Danka Kovinic respectively.
French Open champion Krejcikova needed just one hour and nine minutes to overcome Wang 6-1 6-2 and reach her third final in four tournaments.
Krejcikova controlled the match from the off, on her way to a routine win, with the world number 13 having still yet to drop a single set in the Czech capital.
Martincova had earlier been made to work a little harder for her victory over Greet Minnen, but the number eight seed advanced through to Sunday's final with a 6-3 6-4 win.
The 26-year-old let slip a 4-1 lead in the second set as Minnen pulled it back to 4-4, before taking her second match point with a strong forehand.
At the Lausanne Open, a new singles champion on the WTA Tour will be crowned on Sunday when Tamara Zidansek and Clara Burel face off.
Zidansek proved too strong for semi-final debutant Maryna Zanevska, prevailing 7-5 6-3, while Burel needed to dig deep to get the better of fifth seed Caroline Garcia.
Burel, who unlike Zidansek has never previously reached a WTA singles final at all, was a set and a break down to Garcia but recovered to take the match the distance.
The 20-year-old called a medical timeout in the decider, though she managed to put that behind her as she earned three breaks of serve to stun her French compatriot 5-7 6-2 6-2.
Elsewhere on Saturday, home favourite Dalma Galfi's tournament was brought to an end at the semi-final stage of the Hungarian Grand Prix with a 6-2 3-6 6-2 defeat to top seed Yulia Putintseva.
Wildcard entrant Galfi offered little in the first set to suggest she would push Putintseva all the way, but she did exactly that with a couple of breaks of serve in the second set.
However, Putintseva, looking to add to her only previous singles title at the 2019 Nuremberg Cup, stormed into a 5-1 lead in the deciding set and ended Galfi's hopes with her first match point.
The Russian will next take on Anhelina Kalinina, who led 6-7 (7-5) 4-1 against Danielle Collins in the other semi-final when her opponent withdrew injured.
World number 69 Pliskova struck 28 winners to 13 unforced errors on home soil as she secured a 6-1 7-5 victory in one hour and 22 minutes.
The Czech wrapped up the opening set in just 21 minutes and Martic paid the price for passing up two opportunities to hold serve at 5-5 in the second.
Pliskova, a runner-up in Prague in 2017, made Martic pay by serving out the match and setting up a meeting with Ana Bogdan, who got a walkover after Lesia Tsurenko withdrew prior to their match.
Mertens ensured Simona Halep is not the only seed remaining in the draw by defeating Camila Giorgi 6-4 6-2, while, in matches held over from Tuesday, Laura Siegemund and Tamara Zidansek wasted little time in wrapping up three-set victories over Mayar Sherif and Katerina Siniakova respectively.
It was not a day off for Halep, though. The Romanian joined forces with Barbora Strycova for a doubles match against Veronika Kudermetova and Anastasia Pavlyuchenkova that ended in a 6-3 3-6 10-8 loss.
Mertens, who reached the fourth round at Wimbledon at the start of July, succumbed to a 6-3 2-6 6-2 defeat to Magda Linette – her first loss to the Pole after three straight-set victories in their previous encounters.
The Belgian got just 52 per cent of her first serves in and won 38.5 per cent of points behind her second serve while only converting one of the five break points she earned.
Sixth seed Alison Van Uytvanck retired in the first set of her match against Dalila Jakupovic, while eighth seed Marie Bouzkova overcame Sinja Kraus 6-2 7-6 (7-2).
In Warsaw, fifth seed Garcia by no means had it easy in a 7-5 6-4 success over Doi.
The Frenchwoman committed eight double faults and only got 55 per cent of her first serves in, but by saving six of the eight break points she faced she was able to get the job done in straight sets.
Polish wildcard Maja Chwalinska was a 7-5 6-2 victor over qualifier Rebeka Masarova in only her second Tour-level tournament.
The seventh seed – ranked 90th in the world – gave former Wimbledon champion Angelique Kerber a scare on her SW19 debut at the end of last month before eventually going down 6-4 6-3.
However, despite 10 aces, the Serbian was unable to build on that momentum in the Czech capital, losing 3-6 6-1 6-4 against world number 181 Min.
Min had not won a WTA Tour main-draw match since January 2020.
Swiatek's 6-3 6-2 win against her Romanian opponent was her 48th of the season, already equalling the best tally reached by a female player in the entirety of 2021.
The top seed will have a chance to go one better than Anett Kontaveit and Ons Jabeur from last season when she faces Caroline Garcia in the quarter-finals of her home tournament.
Garcia beat Elisabetta Cocciaretto 6-3 7-5, while Jasmine Paolini dug deep to see off Clara Burel 6-1 6-7 (1-7) 6-0.
There was a big upset at the Prague Open, as defending champion Barbora Krejcikova was eliminated in a 3-6 7-5 (7-5) 6-3 defeat at the hands of Nao Hibino.
Fellow Czech Lucie Havlickova was dispatched in straight sets by top seed Kontaveit, but Linda Noskova will keep the home flag flying after beating Alize Cornet.
Noskova's first career tour-level quarter-final will come against Krejcikova's conqueror Hibino.
