Former champion Andy Murray needed only 56 minutes to beat Bernard Tomic of Australia 6-3, 6-1 and reach the third round of the Sony Open on Saturday.
Second-seeded Murray was the champion four years ago. Tomic fell to 2-15 against top-10 opponents.
On a sunny, humid afternoon, Jo-Wilfried Tsonga beat Viktor Troicki on hard-court for the first time by 7-6 (6), 6-3.
The No. 6-seeded Frenchman evened his record at 3-3 with Troicki, the Serb who'd won their three previous matches on hard-courts.
Troicki had set point at 5-4 and again in the tiebreaker, but Tsonga staved off both and broke Troicki twice in the second set.
Another Frenchman, No. 8 Richard Gasquet, defeated Belgian qualifier Olivier Rochus 7-5, 6-2.
Sam Querrey won for the first time as the top-ranked American man, rallying past Lukasz Kubot 4-6, 6-3, 6-3. Querrey, ranked 20th, this week moved ahead of fellow American John Isner, 23rd.
No. 18 Philipp Kohlschreiber of Germany lost to David Goffin of Belgium 7-6 (5), 4-6, 6-2.
In women's play, defending champion Agnieszka Radwanska, seeded fourth, lost serve seven times and needed nearly 2 1/2 hours to beat Magdalena Rybarikova 7-6 (5), 2-6, 6-3. No. 9 Caroline Wozniacki lost to wild card Garbine Muguruza of Spain, 6-2, 6-4.
No. 5 Li Na beat No. 25 Varvara Lepchenko of the United States 6-2, 6-4. Seeded players had their opening matches after receiving first-round byes.