Tsitsipas, Medvedev and Shapovalov win openers in Halle

The second-seeded Stefanos Tsitsipas needed 2 hours, 22 minutes before he eventually prevailed against French player Gregoire Barrere 6-7 (6), 6-4, 7-6 (3).

Stefanos Tsitsipas, Daniil Medvedev and Denis Shapovalov progressed from the first round of the Halle Open, though some had an easier time at the grass-court tournament.

Stefanos Tsitsipas reacts during his first round tennis match against Gregoire Barrere at the Halle ATP Tour (AP)

The second-seeded Stefanos Tsitsipas needed 2 hours, 22 minutes before he eventually prevailed against French player Gregoire Barrere 6-7 (6), 6-4, 7-6 (3).

Tsitsipas, who was upset by veteran French player Richard Gasquet in Stuttgart last week, was headed for another loss as he trailed by a set and a break at 3-1 down in the second set, but he recovered for a second-round meeting with Nicolas Jarry.

Top-seeded Medvedev, who lost last year's final, defeated American qualifier Marcos Giron 6-4 6-3. Shapovalov beat South African Lloyd Harris 7-6 (1), 6-4.

Nick Kyrgios withdrew to continue his recovery from a knee injury.