Russian third seed Daniil Medvedev eased past home hope Daniel Altmaier 6-3 6-3 at Germany's Halle Open on Monday, looking to find form in his Wimbledon tune-up after early round losses at the Australian Open and French Open.

Bouncing back after a quarterfinal exit in Den Bosch last week, the former US Open winner and 2022 Halle finalist needed just an hour to beat the German, converting three of six break point opportunities and saving both break points he faced.

Altmaier saved two match points on Medvedev's serve but was ultimately beaten on the third, as the twice Wimbledon semifinalist closed out his opening Halle match and inched closer in his chase for a first grass-court title since Mallorca in 2021.

Stefanos Tsitsipas, unseeded at an event for the first time since 2018 ATP Masters 1000 in Cincinnati, edged past Italy's Luciano Darderi 6-4 3-6 7-6(5) in a gruelling first-round battle.

Tsitsipas broke for a 3-2 lead in the first set and held off a late charge from Darderi to take it 6-4. The Italian hit back in style, breaking early for 3-0 and racing to a 6-3 second set to force a decider.

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The final set was tight throughout, with Darderi earning five break points but unable to convert. Tsitsipas kept his composure and clinched the match in a tense tiebreak, needing four match points to seal victory.

It was his first event with coach Goran Ivanisevic, who joined his team after a second-round exit at Roland Garros. Tsitsipas, a former world number three, is now ranked 25th, his lowest position since 2018.

The Greek is looking to resurrect his career and Wimbledon holds particular importance for the 26-year-old, with the fourth round his best showing so far.

Alexander Bublik, Halle 2023 winner, dispatched France's Alexandre Muller 6-4 6-4. The Kazakh broke late in the first set and struck early in the second, dominating on serve to wrap up the match in exactly one hour.

Bublik, who reached the French Open quarterfinals two weeks ago before losing to eventual runner-up Jannik Sinner of Italy, will next face either Halle defending champion Sinner or Germany's Yannick Hanfmann, who play on Tuesday.

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Last year's runner-up Hubert Hurkacz of Poland withdrew from the event due to injury, with Dutchman Jesper de Jong taking his place in the main draw.