Madrid Open: The tournament has seen a welcome return to form for Alexander Zverev, who had won only two matches in his previous three events since lifting the Acapulco title in March.
This is Novak Djokovic's fifth different stint atop the ATP rankings. He spent 122 consecutive weeks as number one between July 2014 and November 2016.
Australian Open: After defeating Dominic Thiem, Grigor Dimitrov will face Aslan Karatsev in the quarter-finals.
Australian Open 2021: Dominic Thiem rallied from two sets down to tame flamboyant Nick Kyrgios 4-6, 4-6, 6-3, 6-4, 6-4 at the Australian Open in front of a raucous crowd.
Australian Open: Dominic Thiem was in top form against Dominik Koepfer, who self-imploded on a hot day with the Austrian domination on his serve, returning well and owning the baseline.
Australian Open 2021: US Open champion Dominic Thiem faced a tough test but managed to beat Kazakh veteran Mikhail Kukushkin 7-6 (7/2), 6-2, 6-3 in the first round.
ATP Cup: Novak Djokovic registered a battling win over Denis Shapovalov in the ATP Cup, before returning 30 minutes later alongside Filip Frajinovic to play the decisive doubles rubber, which Serbia won as well.
Dominic Thiem admitted Monday it will be tough to match his breakthrough year in 2020, but he plans to give it his best shot.
Rafael Nadal, who can move past the injured Roger Federer's 20 Grand Slam titles with victory at the Australian Open beginning February 8, kicks off his season representing Spain at the ATP Cup from Tuesday.
Tennis 2020: The year was mostly about coronavirus, though Rafael Nadal did well, while Novak Djokovic would rather forget it.
Daniil Medvedev came back from a set down to beat Dominic Thiem 4-6, 7-6 (7/2), 6-4 and win the ATP Finals title.
Rafael Nadal, who has never won the elite event in his illustrious career, faltered when serving for the match in the second set and was beaten 3-6, 7-6 (7/4), 6-3.
Dominic Thiem recovered from squandering four match points in a dramatic second-set tie-break to beat Novak Djokovic in the last four at the ATP Finals on Saturday.
Several major American sports have a policy setting out a procedure to be followed in such situations, and Novak Djokovic believes tennis should go down the same route.
Rafael Nadal won his opening round-robin match against Andrey Rublev but defeat against Dominic Thiem meant he faced a shootout against 2019 champion Tsitsipas to reach the semi-finals.
Austria's Dominic Thiem, who beat Stefanos Tsitsipas and Rafael Nadal earlier in the week to win Group London 2020, was well below his best at London's empty O2 Arena in a 6-2, 7-5 defeat.
Rafael Nadal insisted he can still win the ATP Finals for the first time despite a damaging 7-6 (9/7), 7-6 (7/4) defeat against Austria's Dominic Thiem on Tuesday.
Dominic Thiem held his nerve to claim an impressive 7-6 (9/7), 7-6 (7/4) win against Rafael Nadal at the ATP Finals.