Nadal hadn't won an ATP hard-court title in more than three years until the U.S. Open last month, and now the Spaniard is gunning for his third title in five weeks.
Both Nadal and Federer are in contention for the season-ending No. 1 ranking, although only the Spaniard can clinch that honour this week by winning the title in Shanghai.
The 13th-seeded Australian packed his bag and left the court after losing the first set 7-6 (5) to Steve Johnson on Tuesday.
Kyrgios could find himself in hot water again if he does not have a legitimate explanation for his decision to retire after losing the first set of his opening-round match in a tie-break against Steve Johnson in Shanghai Masters.
Bhambri might not have won the match against supremely talented Shapovalov but pushed the 18-year-old Canadian to five sets before losing the second singles tie in the Davis Cup.
Serena Williams has won 23 Grand Slam singles titles, one more than Steffi Graf for the Open-era record. Australian Margaret Court is the all-time leader with 24.
Nadal, 16-time Grand Slam champion, maintained the top spot after claiming the China Open title for the second time in his career on Sunday beating Nick Kyrgios.
World No.1 Nadal, who was tied with Roger Federer and Alexander Zverev at five titles this season, picked up his 75th career singles trophy with the win in Beijing.
The 15th-ranked Garcia, who lost to Halep the two previous times they played, will make her top-10 debut when the new WTA rankings will come out on Monday.
With this win, the Belgian now stands at No. 8 in the ATP Race to London rankings.
The French Open and U.S. Open champion is one of three men to win five titles this year, along with Roger Federer and Alexander Zverev.
The new world number one will play the winner of the semifinal between Garcia and 12th-seeded Petra Kvitova of the Czech Republic in the finals of China Open.
After comfortably winning the first set, the Indo-Chinese duo slumped to a shocking 6-2, 1-6, 5-10 defeat at the hands of Swiss star Martina Hingis and Chan Yung-Jan of China.
The third-seeded Indo-Chinese pair of Sania and Peng came from a set down to beat fifth-seeded Czech pair of Barbora Strycova and Katerina Siniakov 4-6 6-2 10-7 in the quarterfinals.
India have got a bye in the first round, so they will play under new rules only in April when they travel to either New Zealand or China.
The world number one will next play third-seeded Grigor Dimitrov in the semis, who defeated Roberto Bautista Agut 7-6 (5), 4-6, 6-2.
Simona Halep needs to reach to the final in Beijing, and not lose to third-seeded Elena Svitolina, to bump No. 1 Garbine Muguruza from the top spot.
Sania-Peng duo defeated the Belgian-Dutch pair of Elise Mertens and Demi Schuurs 7-5, 6-2 to enter the quarterfinals.
Nadal, who won the French Open and U.S. Open this year, saved all six break points he faced and increased his lead over Roger Federer at the top of the rankings.
The Indo-Argentine duo failed to replicate their good performance in the opening round and slump to a narrow 5-7, 6-7 (6-8) defeat.
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