The British No 2, who reached the Mercedes Open final in Los Angeles last week before losing to Andre Agassi, recovered from a set down to knock out the Argentinian 3-6, 7-6, 6-2 on Wednesday.
Henman, who is seeded seventh here, was joined in the next round by Pete Sampras, who beat Gianluca Pozzi 6-1, 6-2, in his first match since winning Wimbledon. The American, who had minor foot surgery on 15 July, will lose his place at the top of the world rankings to Marcelo Rios if he loses in Toronto.
A ticket for the men's singles final at Wimbledon next year will now cost pounds 60, an increase of pounds 4 on this year's price. Centre Court and No 1 Court ticket prices for each of the 13 days of the tournament have been increased.
There is no change in the ground admission charges, however: pounds 10 for the first five days; pounds 5 for the middle Saturday; pounds 10 for the second Monday; pounds 8 on days eight, nine and 10; pounds 7 on days 11 and 12 and pounds 3 on the last day.