Germany's Tatjana Maria sank the hopes of Brazil's Laura Pigossi by carrying off the Copa Colsanitas title in Bogota, landing a 6-3 4-6 6-2 victory in Sunday's final.

Maria, who won her only previous WTA singles title in Mallorca in 2018, had the serving advantage in a contest between two qualifiers, hitting six aces to Pigossi's zero.

In the two sets that she won, Maria won 80 per cent of her successful first serves (28 of 35), not allowing Pigossi a look at a break point in the opener and saving two opportunities in the third.

Maria won seven matches in nine days while at the event in Colombia, with the 34-year-old dropping only two sets in the process.

The win will see a significant jump in Maria's world ranking, which is currently number 237 after taking time off to have a child.

World number five and the tournament's top seed, Aryna Sabalenka, was upset by American Amanda Anisimova 3-6 6-4 6-3 in the third round at the Charleston Open.

Sabalenka's serve was the key to her early success, connecting on 73 per cent of her first serves, and winning 15 of the 19 points in that situation (79 per cent).

When Sabalenka's first serve percentage fell to 48 in the second set, Anisimova found her footing, breaking twice in the frame, before pouncing on the Belarusian's lacklustre second serve in the deciding set, winning seven of nine opportunities to earn the break and the win.

Sixth seed Jessica Pegula was also bounced in surprising fashion, losing 6-4 3-6 6-4 to unseeded compatriot Coco Vandeweghe.

In a razor-close contest, it came down to who took their chances, as Vandeweghe saved seven of the 10 break points she faced, while Pegula could only save one of five.

World number 10 Ons Jabeur had no problem navigating the challenge of Emma Navarro, winning 6-3 6-2 as she broke her opponent's serve on six occasions.

Canadian seventh seed Leylah Hernandez also fell victim to an unseeded upset, going down 3-6 6-3 6-4 against Poland's Magda Linette.

In a meeting between two top-10 seeds, Belinda Bencic got the better of Madison Keys to edge it 6-4 6-4.

Second seed Paula Badosa had to come from a set down to eventually get the better of Claire Liu 3-6 7-6 (10-8) 6-1.

In the late session, French 12th seed Alize Cornet went down in a close tussle against Ukraine's Anhelina Kalinina 7-6 (7-5) 7-5, while Jabeur won her second match of the day, beating Irina Begu 6-3 6-2.

Meanwhile, in Bogota at the Copa Colsanitas, top seed Camila Osorio dispatched Turkish opponent Ipek Oz 6-3 7-6 (7-4) to move on to the quarter-final where she will meet Elina Avanesyan.

Alize Cornet was the highest seed in action on the first day of the Charleston Open, and showed her class, beating Alycia Parks 6-0 7-5.

Cornet, the 12 seed, was nearly perfect in the first set, winning 86 per cent of her service points (12-14) and 80 per cent of her return points (12-15).

15 seed Amanda Anisimova also made it through, and with an identical scoreline, defeating American compatriot Sachia Vickery 6-0 7-5.

China's Shuai Zhang is the 16 seed, and she also only needed two sets to see off unseeded opponent Francesca Di Lorenzo 6-2 6-4.

Hungary's Anna Bondar earned a second-round matchup against world number three Paula Badosa after defeating the Netherlands' Arianne Hartono 6-1 6-4.

Italian Jasmine Paolini will meet six seed and world number 13 Jessica Pegula in the second round after beating Romania's Gabriela Lee 6-2 6-3.

Meanwhile, in Bogota at the Copa Colsanitas, Brazilian qualifier Laura Pigossi defeated five seed Harmony Tan 6-4 6-3.

Top seed and world number 33 Camila Osorio will kick off her tournament on Tuesday against Ylena In-Albon.

Amanda Anisimova, Alize Cornet and Paula Badosa all survived scares on Monday to advance through to the second round of the Volvo Car Open in Charleston.

Number 13 seed Anisimova came from a set down to beat Magda Linette 5-7 6-2 6-3 on Monday, dropping serve only once in those last two sets.

Cornet, who reached the quarter-finals of this event in 2018, needed just under three hours to overcome Bernarda Pera 4-6 6-4 6-4.

Badosa also needed all three sets to see off Varvara Gracheva, the Spaniard hitting back to prevail 3-6 7-5 6-1.

Ajla Tomljanovic and Zarina Diyas were also among those to book a place in the next round, beating Christina McHale and Natalia Vikhlyantseva respectively in straight sets.

In the other WTA Tour event, Copa Colsanitas top seed Zheng Saisai eased past Usue Maitane Arconada 6-3 6-1 and will now face Stefanie Voegele.

Wang Yafan was another Chinese player to advance in Bogota, seeing off Emiliana Arango 6-4 5-7 7-5.