Kei Nishikori sees off Lucas Pouille at Gerry Weber Open

Nishikori lost the first set but bounced back to beat Pouille 6-7 (5/7) 6-1 6-4 as the world number four returned to the grass ahead of Wimbledon, which starts in two weeks.

Fifth seed David Goffin was also given a tough examination as he edged out talented Croatian Borna Coric 7-6 (7/5) 6-7 (3/7) 6-4 to book his place in the second round.

At the Aegon Championships at Queen's, the opening day was spoiled by rain as Britain's Dan Evans saw his first round match against Paul-Henri Mathieu postponed.

Top seed Andy Murray is set to launch his grass-court season against world number 51 Nicolas Mahut on Tuesday.

The Scot, who will have new coach Ivan Lendl in attendance for the first time since their reunion was announced on Sunday, has won four of his last five meetings against the Frenchman.

In the two tournaments that were prolonged into Monday due to rain, Dominic Thiem overcame Philipp Kohlschreiber 6-7 (2/7) 6-4 6-4 to lift the Mercedes Cup in Stuttgart, while defending champion Nicolas Mahut beat Gilles Muller 6-4 6-4 in the Ricoh Open final at s-Hertogenbosch.