Earlier, Ukraine took a 2-0 lead over Japan as world number five Elina Svitolina took the first point of the Billie Jean King Cup era.
He leads the men's seedings ahead of defending champ Roger Federer, with Bulgarian Grigor Dimitrov seeded third.
Rafael Nadal boasted after his first-round US Open match that he had a video recording of being the first player to hit a ball in practice under the new roof at Arthur Ashe Stadium.
Serena Williams had to dig deep to fend off Latvian challenger Jelena Ostapenko as she wrapped up Friday's play at the Fed Cup in Seattle with a hard-fought victory that gave the United States a 2-0 advantage. Williams' experience and savvy ways showed in critical moments against the 22-year-old Ostapenko as she prevailed 7-6(4), 7-6(3) in a match that took one hour and 46 minutes.
Serena Williams has never been one to approach the net until it is time to exchange post-match pleasantries with an opponent but on Thursday she broke from tradition and it paid off with a trip to the U.S. Open final.
Petra Kvitova takes on Naomi Osaka in Saturday's Australian Open final with one of them set to emerge as a fresh champion at Melbourne Park.
Maria Sharapova will not care less what reception she receives when she plays her first Australian Open match since completing a doping ban on Tuesday, according to three-times Melbourne winner Mats Wilander.
The 27-year-old Romanian beat Sloane Stephens at Roland Garros to win her maiden Grand Slam title in June and will have spent 40 weeks at the top of the rankings by the end of the season.
Former world number one Maria Sharapova avenged her US Open loss to Anastasija Sevastova with a 7-6(3), 5-7, 7-6(7) victory over the Latvian in the China Open first round on Saturday.
Images from Day 6 of Wimbledon at the All England Lawn Tennis and Croquet Club in London, on Saturday.
Serena William powered her way to within two victories of a seventh US Open title on Tuesday and while she refused to look ahead there are many willing to do it for her, and what they see is a suddenly open path to a 24th Grand Slam.
The seventh-seeded Bulgarian advanced to his eighth ATP World Tour Masters 1000 quarter-final with a 6-3, 7-5 victory over Del Potro, who struggled with the intense heat in the closing stages of the one hour, 39 minute match.
Former world number one Novak Djokovic showed signs of a return to form with an impressive 7-5, 6-4 victory over Japan's Kei Nishikori in the opening round of the Madrid Open on Monday.
Osaka has had to mix things up during a grinding progression to the last eight at Melbourne Park
The coach of Ana Ivanovic, and father-in-law of men's world number two Andy Murray, collapsed in the stands at Rod Laver Arena during the Serb's third round clash with American Madison Keys on Saturday, causing play to be suspended indefinitely.
The 22-year-old French Open champion downplayed her chances following a 2-6, 6-0, 6-3 win over Belgian qualifier Elise Mertens in the opening round on Monday, telling the courtside crowd it would take a miracle for her to reach the final.
The latest tennis rankings have been announced by the ATP and WTA
Images from Day 8 of the Australian Open in Melbourne on Monday.
Roger Federer is one win from becoming the oldest world number one in ATP Tour history after beating Philipp Kohlschreiber 7-6(8), 7-5 in the last 16 of the Rotterdam Open on Thursday.
World No 1s Andy Murray and Angelique Kerber have been named top seeds for the first major of the season, Australian Open, which will commences on January 16.
At one stage Yuki was a break up, serving for the opening set but lost his serve and eventually the set. After drawing parity, Yuki twice lost his serve to fall behind 0-3 in the decisive set and never recovered.
Former French Open champion Ana Ivanovic was shaken up when a spectator was injured falling down the stairs on Rod Laver Arena but recovered her composure to ease into the third round at the Australian Open on Thursday.
Keys and Stephens to put friendship to grand slam test
After a season plagued with injuries and a health scare Jelena Jankovic, perhaps more than anyone, needed the tonic of a few days soaking up the Mallorcan sunshine last week.
A summary of Sunday's matches at the French Open.
Eleven-times champion Rafael Nadal booked his place in the semi-finals of the Barcelona Open semi-finals by beating German Jan-Lennard Struff 7-5, 7-5 in a hard-fought match on Friday.
Russian qualifier Daniil Medvedev stunned home favourite Kei Nishikori in Tokyo on Sunday, winning the final of the Japan Open 6-2, 6-4 in just over one hour.
Greek tyro Stefanos Tsitsipas' dream run at the Rogers Cup continued on Friday as the teenager toppled defending champion Alexander Zverev 3-6, 7-6(11), 6-4 to reach the semi-finals in Toronto.
A rampaging Madison Keys completed an American sweep of the US Open women's quarter-finals on Wednesday, dismissing Estonia's Kaia Kanepi 6-3, 6-3 to guarantee an American champion at the year's final Grand Slam.
Melbourne man McNamara won five singles titles and 19 in doubles and teamed up with compatriot Paul McNamee to win the Australian Open doubles in 1979 and Wimbledon twice in 1980 and 1982.
But for the 23-year-old Bouchard, a former world number five who has slumped to 56th in the rankings, it was another blow after her first-round exit in Indian Wells.
Maria Sharapova's outfit sparkled even if her play sometimes didn't during her grand slam return at the US Open but the former world number one's run to the fourth round showed she is back in business on and off the court.
Maria Sharapova's contentious and captivating US Open run came to an end on Sunday when Latvia's Anastasija Sevastova beat her 5-7, 6-4, 6-2 to reach the Flushing Meadows quarter-finals.
Defending champion Sloane Stephens was sent packing from the Miami Open on Sunday after a 6-3, 6-2 loss to Germany's Tatjana Maria in the third round.
Belarusian ninth seed Aryna Sabalenka held off a spirited challenge from American Alison Riske to win 6-3, 3-6, 6-1 and successfully defend her Wuhan Open title on Saturday.
Images from Day 3 of the French Open matches played at Roland Garros on Tuesday
Big-serving Isner reaches Montreal second round
Rafael Nadal swept into the quarter-finals of the Italian Open on Thursday with a ruthless 6-4, 6-1 victory over Canadian teenager Denis Shapovalov. The top seed, who will reclaim the world number one ranking from Roger Federer if he wins his eighth title in Rome, turned in a near-flawless performance, losing only five service points as he honed in on victory in an hour and 22 minutes.
Images from Day 1 of the US Open in New York, on Monday.
Venus Williams staged a spirited comeback to down third seed Petra Kvitova 4-6, 7-5, 6-4 and reach the third round of the BNP Paribas Open in Indian Wells on Saturday.
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