Carlos Alcaraz, a 17-year-old wildcard, will face Rafael Nadal in the second round of the Madrid Open, with the top seeds set to get their campaigns underway on Tuesday and Wednesday.
Alcaraz, featuring in an ATP Masters 1000 event for just the second time, was in impressive form as he saw off France's Adrian Mannarino 6-4 6-0.
The teenager, who will face Nadal on his 18th birthday on Wednesday, fired 19 winners as he took the initiative against his more experienced opponent and his reward is significant.
He became the tournament's youngest ever match winner, beating the record set by Nadal.
"For me, [to] play against Rafa is a dream come true," Alcaraz said as he readies himself to go up against the 20-time grand slam winner.
"Since I was a kid, I wished to play a match against Rafa and now I will be able to here [on] the Centre Court of La Caja Magica in Madrid. It is a really special match against Rafa."
He told Tennis Channel: "It's the best present for my birthday."
The biggest casualty of the day was 13th seed Grigor Dimitrov, who lost 3-6 6-3 7-6 (7-5) to Lloyd Harris early on, the South African now 4-0 against top-20 opponents this year.
Two qualifiers in Pablo Andujar and Marcos Giron played out a remarkable encounter that lasted three hours and 21 minutes.
The first set alone clocked in at just over an hour and a half, but eventually Giron came through the gruelling clash 6-7 (8-10) 7-6 (7-4) 7-5 to set up a meeting with third seed Dominic Thiem.
Fabio Fognini defeated Carlos Taberner 7-6 (7-4) 2-6 6-3 for the right to face eighth seed and Italian countryman Matteo Berrettini.
Diego Schwartzman, the seventh seed, awaits Aslan Karatsev after he beat Ugo Humbert in straight sets in what was the Russian's debut appearance at the tournament.
Dan Evans and John Isner were among the other players to secure progress on Monday.
Swiatek confirms split with coach Wiktorowski and Wuhan Open withdrawal
Iga Swiatek has announced the end of her three-year partnership with coach Tomasz Wiktorowski, saying the split was a mutual agreement.
Wiktorowski, who joined Swiatek's team in 2022, helped her become the first Polish player to reach world number one and she has since spent 123 weeks at the top of the rankings.
Swiatek also won 19 of her 22 career titles and an Olympic bronze medal in Paris earlier this year with Wiktorowski, along with four grand slam victories.
"After three years of the greatest achievements in my career, together with my coach Tomasz Wiktorowski we decided to part ways," Swiatek wrote on Instagram.
"I want to start with a big thank you and appreciating our work together."
Swiatek has not competed since losing to Jessica Pegula in the quarter-finals of the US Open, choosing to withdraw from the China Open due to personal reasons.
The 23-year-old has also pulled out of the recent Korea Open in Seoul, citing fatigue, and next week's Wuhan Open.
Swiatek won the French Open and US Open during her opening season with Wiktorowski, before embarking on a 37-match winning run in 2022 - the longest streak by a woman this century.
The Pole won a fifth grand slam, which was her fourth with Wiktorowski, at Roland Garros in June, making it three consecutive wins at the tournament in Paris.
"Coach Wiktorowski joined my team for three seasons, when I strongly needed changes and a fresh approach to my game," Swiatek continued.
"His experience, analytical and strategic attitude and enormous knowledge about tennis helped us to achieve things I've never dreamed of only a few months after we started working together."
But Swiatek was disappointed with her hard-court performances this season, exiting the Australian Open in the third round and the US Open in the last eight.
The Pole said she has held "first talks" with prospective new coaches and will take a "couple of weeks" to start work with her next appointment.
"Our main goal was to become number one player in the world and coach Wiktorowski was the one who said it first," Swiatek concluded.
"Due to this important change on my team, I give myself a couple of weeks to start cooperation with a new coach.
"I'm in the middle of first talks with coaches from abroad (non-Polish) because I'm ready to take the next step of my career. I will let you know when I make a decision."
Medvedev rallies to straight-sets win in Shanghai opener
Daniil Medvedev held off a stern test from Thiago Seyboth Wild to edge through his Shanghai Masters opener on Friday.
The Russian won the tight contest in straight sets, prevailing 7-5 7-5 in just under two hours.
Seyboth Wild started brightly, superbly defending five break points in the opening game before breaking Medvedev to take a 3-1 lead.
A three-game winning run at the end of the first set was enough for the world number five to edge in front.
The Brazilian made another strong start in the second but was his own worst enemy as he racked up 47 unforced errors throughout the match to Medvedev's 28.
Despite going down a break again, Medvedev rallied, staying patient to mount another comeback and book his place in the next round against Matteo Arnaldi.
Data Debrief: Patience pays off
Last year, Seyboth Wild stunned Medvedev in the opening round at Roland Garros, as his high-risk, high-reward method paid off and he earned the win with 69 winners and 77 unforced errors.
Despite pushing the 28-year-old all the way, it did not garner the same reward this time around, despite getting 29 winners to Medvedev's 17.
Sabalenka stunned by Muchova in Beijing quarter-finals
Karolina Muchova secured an upset at the China Open, snapping Aryna Sabalenka's 15-match winning streak to reach the semi-finals.
The Czech prevailed in two hours and 48 minutes with a 7-6 (7-5) 2-6 6-4 win over the number one seed on Friday.
Muchova started strong, forcing Sabalenka to defend three break points in the opening game, but they were evenly matched throughout.
Sabalenka almost took the first set, but Muchova held her nerve, successfully fighting back against two set points before taking the tie-break.
The Belarusian looked back to her free-flowing best in the second though, earning two breaks as she forced the decider in comfortable fashion.
Sabalenka took an early lead in the final set, but from 4-2 down, Muchova clawed her way back, going on a four-game winning streak at the end to book a meeting with Qinwen Zheng or Mirra Andreeva in the final four.
Data Debrief: Czech mate
Given Sabalenka's recent hot streak, this does look like an upset, but it is actually pretty run-of-the-mill for Muchova.
She has now won her last three matches against Sabalenka in WTA events, defeating her at Cincinnati, Roland Garros 2023 and China Open 2024.
Excluding the BJK Cup, only Iga Swiatek (85.3%) has a higher winning percentage than Muchova on hard-court in WTA events during 2024 (84.6%, 11-2), surpassing Sabalenka (82.5%, 33-7).
The 28-year-old has reached just her second career semi-final and is the player with the fewest WTA-1000 wins during the season before the start of the China Open (one) to reach this stage of the tournament.
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