Top-ranked Jannik Sinner will play rival Carlos Alcaraz in the final of the China Open after recording a 6-3, 7-6 (3) victory over home favourite Bu Yunchaokete on Tuesday in Beijing.

Sinner and Alcaraz accounted for all four Grand Slam titles this year between them. Alcaraz leads the head-to-head series 5-4, including wins at both their meetings this year, but Sinner doesn't believe that recent history will have a bearing on Wednesday's final.

"We know each other very well now, but every match is different, so the situation on the court is also a bit different than it was the last two matches," Sinner said.

The 23-year-old Italian is the defending champion and hasn't appeared distracted by the World Anti-Doping Agency announcing Saturday it was seeking a ban of one to two years for the U.S. Open champion, who tested positive twice for an anabolic steroid in March.

Chinese wild card Yunchaokete, ranked 96th, couldn't take any of his three break-point chances in the first set.

Sinner's experience proved crucial during the pivotal moments, especially in the second-set tiebreaker, where he surged to a 6-1 lead.

Earlier, third-ranked Alcaraz's athleticism was again on show as he advanced to the final with a 7-5, 6-3 victory over Daniil Medvedev.

"I felt great on the court once again, so I'm really happy about it," Alcaraz said. "I couldn't ask for a better semifinal."

The four-time Grand Slam champion, including this year's French Open and Wimbledon, extended his head-to-head record against the Russian to 6-2.

The 21-year-old Spaniard found his way through a testing first set that had five breaks of serve, but crucially it was Alcaraz's third service break in the 12th game that secured the set.

Alcaraz has now won eight straight matches -- across the Davis Cup, Laver Cup and in Beijing -- since his loss to Botic van de Zandschulp in the second round at the U.S. Open.

WATCH l Sinner wins his 1st U.S. Open title:

Sinner beats Fritz to claim his 1st U.S. Open title

Italy's Jannik Sinner defeats Taylor Fritz of the United States 6-3, 6-4, 7-5 in the men's final at the U.S. Open.

Osaka out with back injury

Coco Gauff advanced to the quarterfinals when Naomi Osaka retired at 3-6, 6-4 because of a lower back injury.

Osaka, a four-time major champion, was leading 4-3 in the second set before Gauff won three straight games.

The sixth-ranked Gauff then helped carry Osaka's bags off the court.

Gauff hit six aces compared to Osaka's one and improved to 3-2 over her opponent at WTA tournaments.

She will next meet No. 115-ranked Yuliia Starodubtseva, who earlier upset No. 14 Anna Kalinskaya 7-5, 6-0.

Paula Badosa reeled off 11 of the last 12 games in a 6-4, 6-0 victory over U.S. Open finalist Jessica Pegula to reach her eighth career quarterfinal at a WTA 1000-level event.

"She's one the of the players I never want to face -- she's very solid, hits very flat, changes very well direction," said Badosa, who was 0-3 previously against Pegula. "I prepared myself for a battle, but I think today everything worked pretty well."

Badosa next faces 35-year-old Chinese player Zhang Shuai, who continued her resurgence with a 6-4, 6-2 win over Magdalena Frech of Poland.

Fils captures Japan Open title

Arthur Fils saved a championship point and rallied to beat Ugo Humbert 5-7, 7-6 (6), 6-3 in the final of the Japan Open to earn his third tour-level title.

The championship point was in the second-set tiebreaker against his French compatriot.

The 20-year-old Fils struggled with an injury to his left leg for much of the second set and when trailing 4-3 in the second set -- with three break points for his opponent -- it looked almost certain that Humbert would go on to win his seventh final in seven appearances.

Fils defeated four top-20 opponents -- U.S. Open finalist Taylor Fritz, defending champion Ben Shelton, Holger Rune and Humbert – on his way to the title.