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The 31-year-old former Wimbledon and French Open champion had been provisionally suspended since October 2022 after testing positive for banned blood-booster roxadustat at the US Open last year
The top-ranked Americans were hardly tested as ninth seed Fritz crushed compatriot Steve Johnson 6-2 6-1 6-2 in Louis Armstrong Stadium after Tiafoe, the 10th seed, beat American Learner Tien 6-2 7-5 6-1 inside Arthur Ashe Stadium
The 24-year-old Czech rose 32 places to 10th in the new WTA rankings after winning her first Grand Slam title.
Professor McGonagall of 'Harry Potter' was also joined by her co-star Emma Watson.
The Spaniard defeated the veteran in a thrilling five-setter.
The Czech Republic player stuned Tunisia's Ons Jabeur in straight sets in the final.
Djokovic, who overwhelmed Alcaraz in the French Open semifinals last month, is bidding for a record-equalling eighth Wimbledon crown to become the oldest men's champion and match Margaret Court's all-time record of 24 Grand Slams.
Jabeur showed incredible endurance on Thursday to absorb the brutal power of second seed Aryna Sabalenka to claim a 6-7(5) 6-4 6-3 victory.
They lost in straight sets to top seeds Wesley Koolhof of the Netherlands and Great Britain's Neal Skupsk in the semifinals.
The World No 1 defeated his childhood friend Holger Rune of Denmark in the quarterfinals.