Andy Murray acknowledged he produced a nervous performance against Radu Albot on Saturday but suggested it was due to the pressure of a kind Indian Wells Masters draw.
Murray had been due to play Pablo Carreno Busta in the second round in California, only for the 15th seed to pull out with injury.
The three-time major champion instead defeated Albot in 6-4 6-3 for his first straight-sets victory of the season.
That sets Murray up to play fellow Briton Jack Draper in round three ahead of a potential round-four meeting with top seed Carlos Alcaraz, the best player in the draw after Novak Djokovic was unable to enter.
Murray was in complete control against Albot but played with nerves, explaining: "I didn't know if it was because of [the change of opponent].
"I was trying to give reasons for why I may have felt that way. I felt nervous on the court.
"A lot of the way that Radu plays and Carreno Busta plays is not too dissimilar, in terms of the way they like to play points and maybe where and how they like to serve.
"Obviously there are differences in their games, but it wasn't a huge change in terms of my game plan or what I was expecting going into the match.
"But maybe I felt like it was a good opportunity for me and that the draw had opened up slightly. I obviously wanted to try to finish the match quickly."
Yet those nerves are not a problem for Murray, who says he would rather play under that pressure.
"I generally much prefer feeling nervous when I play matches and feeling pressure," he said. "It just felt a bit out of sync with the situation. I was in, I guess, pretty decent control of the match.
"I was serving well, I was hitting the ball pretty well, but there was just more tension than probably there should have been out there on the court.
"But usually I prefer to feel nerves, providing they are in check. And maybe they weren't, for whatever reason.
"I would way rather feel more tension than feel flat, which is really never a good sign for me. If I wake up and I don't feel any of the butterflies or anything like that, it's generally a bad sign."
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.
Wawrinka reflects on 'tough year' after reaching ATP 1000 hard-court milestone
Stan Wawrinka reflected on a "really tough year" after racking up a new ATP 1000 milestone with his first-round victory over Giovanni Mpetshi Perricard at the Shanghai Masters.
The three-time grand slam champion secured a 7-6 (7-2) 7-6 (8-6) victory in China in what was the first ATP meeting between the two.
According to Opta Ace, it represented Wawrinka's landmark 100th hard-court victory in ATP 1000 events, becoming the 12th player to do so.
Speaking on court after the victory, the veteran 39-year-old said: "It's been a really tough year so far, but I'm not getting younger so I'm trying to keep pushing myself.
"I'm happy with the match. I think it was a really good level. I was playing really good, one of the best matches of the year for me.
"He's such an aggressive player. It was great to be here, so much support here, so I'm enjoying my time in China."
Wawrinka, who only had five ATP wins this year before featuring in Shanghai, next faces Flavio Cobolli in round two.
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