American Jim Courier began the defence of his Masters Tennis title at London's Royal Albert Hall with a 6-2 6-4 win against Swede Mats Wilander. He broke Wilander twice before serving out for the first set and then broke him again in the seventh game of the second set to ensure victory.
In Tuesday's other action, Spaniard Sergi Bruguera beat Sweden's Mikael Pernfors 6-4 6-1.
Also Australian Pat Cash beat Frenchman Henri Leconte 7-6 (7-4) 7-5.
Cash, the 1987 Wimbledon champion, came through the first-set tie-break 7-4 and cranked up his serve to 123mph to go 4-1 up in the second set.
But 42-year-old Leconte pulled back to 5-5 before Cash broke serve and then served out to take the match.
"It's difficult to concentrate against him," said 40-year-old Cash.
"He starts having a bit of fun and then suddenly hits six great winners in the next 10 shots. It's not too much fun for you when he does that."
Another delay hit plans to introduce Hawk-Eye technology, which would allow players to challenge line calls anywhere on the court for the first time in a world event. It was put back by 24 hours because of technical problems.
Tournament director John Beddington said: "We wanted to be absolutely perfect before using it in live matches and upon testing we found that one line had a couple of glitches.
"With it being a temporary playing surface erected on to a platform, it is more difficult for the Hawk-Eye people to implement but with a further day of testing it should be 100%."