Haas needed barely an hour to eliminate Tsonga 6-1, 6-4. Haas cashed in three of his four break-point chances and lost just 13 points in nine service games.
Haas had lost just two games in a first-round match and was just as sharp in the second against Tsonga. He had a lot of success against Tsonga's second serve, winning 71 percent (10-of-14) of the points in that situation.
He'll go against eighth-seeded Marcos Baghdatis in the quarterfinals. Baghdatis rallied for a 1-6, 6-4, 6-4 victory over Dustin Brown. Baghdatis dropped his serve three times in the opening set but didn't see a break point the rest of the way.
No. 3-seeded Marin Cilic handled Matthias Bachinger 6-3, 6-2, dropping only 13 points on serve and not allowing Bachinger a break-point opportunity.
Sixth-seeded Mikhail Youzhny outlasted Santiago Giraldo for a 6-7 (2-7), 6-4, 6-4 win. Youzhny had 13 aces and saved all five of the break points he saw on the day.