Alexander Zverev Upsets Novak Djokovic With 6-4, 6-3 Victory at ATP Finals

The 21-year-old is the youngest champion of the event since Djokovic claimed the first of his five titles a decade ago.

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LONDON — Alexander Zverev upset Novak Djokovic to claim the biggest title of his career with a 6-4, 6-3 victory at the ATP Finals on Sunday.

The 21-year-old Zverev became the youngest champion of the season-ending event since Djokovic claimed the first of his five titles a decade ago, and the first from Germany since 1995.

Top-ranked Djokovic was attempting to tie Roger Federer’s record of six titles but followed the same path as the Swiss great, who lost to Zverev in the semifinals at the O2 Arena.

Djokovic’s serve hadn’t been broken all tournament until the final. Zverev did it once in the first set and three times in the second, completing the victory with a spectacular backhand winner up the line.

Both players began the match in the same form that had seen them earn straight-sets semifinal victories a day earlier, with few points going against the server.

It was Djokovic, who had lost just two of his previous 37 matches, who began to feel the pressure as consecutive forehand errors gave Zverev a chance to serve out the opening set at 5-4.

Fans gave Zverev a huge ovation as he stepped up to serve, and it appeared to inspire him. Three straight aces brought up three set points, the second of which he took when Djokovic sent another forehand long.

Zverev even began to outlast Djokovic in longer rallies, an area of the game the 14-time Grand Slam champion usually dominates. A 26-shot duel brought up another break point in the opening game of the second set and, although Djokovic saved it, Zverev won another lengthy exchange moments later with a forehand winner to go 1-0 up.

With the biggest win of his career in sight, Zverev began to show some nerves. Although he is the only active player outside of the Big Four of Djokovic, Federer, Rafael Nadal and Andy Murray to possess three or more Masters titles, the young German has only reached one Grand Slam quarterfinal.

Two double faults and two backhand errors gifted Djokovic an immediate break back, but Zverev quickly refocused to win a 28-shot rally on his way to breaking in the following game.

From there he remained solid on serve, before ending with a flourish. Having been pushed wide, a backhand winner on the run drifted past the helpless Djokovic.

Zverev sunk to the ground in tears as Djokovic sportingly crossed the net to embrace the player who will now be considered among the favorites to end the Serb’s run of two consecutive Grand Slam victories in Australia in two months’ time.

Earlier, American pair Mike Bryan and Jack Sock saved a match point in the deciding tiebreaker to beat Pierre-Hughes Herbert and Nicolas Mahut 5-7, 6-1, 13-11 for their first ATP Finals doubles title together.

Having failed to take advantage of five championship points during the first-to-10 match tiebreaker, Bryan and Sock then had to save one against their French opponents before finally closing out victory.

“It was a hell of a match,” Bryan said.

The 40-year-old Bryan has now won the tournament five times. He won four times with his usual partner — and brother — Bob, who has been out with an injured hip since May.

Sock and Bryan have dominated since teaming up, winning Wimbledon and the U.S. Open before finishing their season in style in London.

“It’s been a hell of a ride,” Bryan said. “This could be our last hoorah because Bob’s training back in Florida.”