Highlights: Marius Copil stuns Alexander Zverev, 6-3, 6-7 (6), 6-4 in Basel semifinals

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Alexander Zverev leads the tour in wins this season, notching 52 victories while reaching the semifinals in Basel this week. That kept him in front of Dominic Thiem, who has 50 but exited in the third round of Vienna. Behind them are Juan Martin del Potro at 47, and Rafael Nadal at 45 victories, both sidelined with injury.

Zverev is 52-17 for the season, with three titles including Washington and Madrid. But he also has two finals and three semifinals, and says that those showings have also helped him rack up wins.

'You, obviously, want to play every match on a very high level and very consistent level. You're always trying to focus and play your best," Zverev told TennisTV at Basel. "I've played a lot of tournaments where I've gone into the deeper [rounds] of tournaments, especially on clay-courts. I've had a very good clay-court season."

The 21-year-old German is still underachieving at the Grand Slams, reaching his first quarterfinal at the French Open and exiting in the third round of the other three events. But he still has two more events, the Paris Masters and the ATP Tour Finals, where he will try to add to his wins total for the season.

"Obviously, it's great, to have the most wins on tour, but the season doesn't stop here," he said. "I'm excited to be back in Europe, I'm excited to be back in the European circuit, and indoors."

Zverev is No. 5 in the ATP rankings.