A strangely lethargic Novak Djokovic outclassed Finland's Jarkko Nieminen 6-4, 6-2, 6-3 to move safely into the Wimbledon third round.
The world number one and top-seed dropped serve in the opening game of the match and appeared distracted in a performance littered with loose serves and uncharacteristic errors.
Serb Djokovic was still far too good for 33-year-old world number 92 Nieminen who was playing in his final Wimbledon.
The defending champion broke in the sixth game of the third set and completed victory when Nieminen sent a forehand wide.
Featured: Laying the Wimbledon seeds
Djokovic will play Australian Bernard Tomic, the 27th seed, in the last-32.
Meanwhile, Kei Nishikori's Wimbledon campaign ended abruptly on Wednesday when the Japanese fifth-seed was forced to pull out with a troublesome calf injury.
On Monday it was clear the problem that first flared up in Halle 11 days ago, when he had to quit midway through his semi-final, was again troubling him as he was stretched into a fifth set by Italy's Simone Bolelli.
He had the stricken left calf re-strapped while leading 3-0 in the decider and while that was enough to carry him over the finishing line in his first round match - Monday's three and a half hour battle proved to be his undoing.
"It is same injury. Got better before the first match. I thought it was really going to be okay. But last match in fifth set I was hurting too much," said the dejected fifth seed who had been due to face Colombian Santiago Giraldo.
7-Milos Raonic (Canada) beat Tommy Haas (Germany) 6-0 6-2 6-7(5) 7-6(4)
26-Nick Kyrgios (Australia) beat Juan Monaco (Argentina) 7-6(5) 6-3 6-4
17-John Isner (U.S.) beat Matthew Ebden (Australia) 6-2 7-6(8) 6-4
1-Novak Djokovic (Serbia) beat Jarkko Nieminen (Finland) 6-4 6-2 6-3
11-Grigor Dimitrov (Bulgaria) beat Steve Johnson (U.S.) 7-6(8) 6-2 7-6(2)
27-Bernard Tomic (Australia) beat Pierre-Hugues Herbert (France) 7-6(3) 6-4 7-6(5)
Santiago Giraldo (Colombia) beat 5-Kei Nishikori (Japan) walkover
21-Richard Gasquet (France) beat Kenny De Schepper (France) 6-0 6-3 6-3
|Nishikori reached the final of last year's US Open [Getty Images]