Blake, who has twice made the quarterfinals at the Open, won the first two sets against the 54th-ranked Lacko before the rain delay.
Other players starting Monday included third-seeded Andy Murray of Britain, coming off his Olympic gold medal. He was facing Alex Bogomolov Jr. of Russia. Top-seeded Roger Federer plays American Donald Young in the night session.
Also playing in Arthur Ashe Stadium are No. 3 Maria Sharapova, against Melinda Czink of Hungary, and No. 23 Kim Clijsters, opening the final tournament of her career with a first-round match against American Victoria Duval. Clijsters missed last year with an injury, but has won the tournament the past three times she’s entered — in 2005, 2009 and 2010.
The Williams sisters, No. 2 Novak Djokovic and No. 20 Andy Roddick, the 2003 champion, are among those who start later in the week.
AP National Writer Eddie Pells contributed to this report.
By Elaine Donnelly
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