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Zverev continued to play solidly through the first five games of the second set, earning a double break to serve at 4-1.
But then came moments of tension. Serving at 4-1, 15-all, Zverev inexplicably opted to serve and volley on two straight points and shortly lost his serve. The next game lasted 12 minutes. On four occasions, Zverev earned and lost a break point. Thiem held. Now Zverev served at 4-3.
Not since last fall’s US Open final had these two played one another. Zverev then had led two sets to love and 5-3 in the fifth, but eventually lost in a decisive tiebreaker. That win gave Thiem an 8-2 lead in their rivalry.
But there would be no meltdown for Zverev in Madrid. One of his two wins versus Thiem had come here three years ago in the finals. Likely that memory was more comforting than the anguish of New York. Serving at 4-3, Zverev hunkered down with big serves and groundstrokes. His serve was even more impressive in the 5-4 game, opening up with two unreturnable deliveries. At 40-15, the combination of a drop shot and a forehand passing shot winner finished off the match.
Zverev plays the winner of the semifinal between Casper Ruud and Matteo Berrettini. He’s never played Ruud and is 2-1 against Berrettini.
“The job is not done yet," Zverev said. "Tomorrow I have a very difficult opponent no matter who it's going to be. I hope I can continue playing and performing the way I am.”
As Roland Garros nears, what to make of Zverev? Though he has danced among the elite for some time now—finishing each of the last four years in the Top 10—only in 2020, in Melbourne, did Zverev advance to his first Grand Slam semifinal.
His last three trips to Paris span generations. In 2018, having reached a Slam quarter for the first time, he went out to a near-peer, Thiem. The next year, Zverev as eliminated in the quarters by a superior elder, Novak Djokovic. But last fall, perhaps still physically and emotionally drained from his US Open run, Zverev lost in the round of 16 to a younger player, Jannik Sinner.
Zverev is still just 23 years old. He also started off 2021 well. At the Australian Open, Zverev reached the quarters, losing to Djokovic, 7-6 in the fourth. A month later, he won the title in Acapulco, beating Stefanos Tsitsipas in the finals to earn his 14th ATP singles title.
Still, when it comes to the majors, Zverev continues to occupy the fork in the road between frequent contention and grand ascension.