Kevin Anderson survived a scare to reach the second round of the Fever-Tree Championships at Queen's Club.
Last year's Wimbledon runner-up took on British number two Cameron Norrie in his first outing since recovering from the elbow problem which forced him to miss the entire clay-court season.
The signs of ring-rust were evident as Norrie broke the South African's serve in the opening game, which lasted just over eight minutes.
Norrie took the opening set but Anderson claimed the second after a tie-break and a solitary break in the decider gave the world number eight a 4-6 7-6 (5) 6-4 win.
Reigning champion Marin Cilic of Croatia beat Chilean Cristian Garin 6-1 7-6 (5) and Russian fourth seed Daniil Medvedev knocked out Spain's Fernando Verdasco 6-2 6-4.
At the Halle Open second seed Alexander Zverev of Germany came through a tough opener against Dutchman Robin Haase 6-4 7-5.
Third seed Karen Kachanov of Russia beat Serbia's Miomir Kecmanovic 7-6 (5) 6-4 and Pierre-Hugues Herbert won the all-French clash against fifth seed Gael Monfils 7-6 (6) 6-4.
Top seed Roger Federer faces Australia's John Millman on Tuesday.