Tomic off to a flier, Cilic edges past Struff
The world number 52 made short work of his Spanish opponent - ranked 16 places above Tomic - as he cruised to a 6-3 6-0 victory in the ATP 250 hard court event on Tuesday.
After losing his opening service game, Tomic bounced back with two breaks of his own to claim the first set before totally dominating the second, in which Granollers claim just two points from the Australian's serve.
Tomic will now face qualifier Blaz Kavcic in the second round after the Slovenian upset the odds to beat Finn Jarkko Nieminen 6-4 6-3.
Seventh seed Marin Cilic survived an early scare to come away with a 3-6 6-3 6-3 win from his clash against qualifier Jan-Lennard Struff.
The Croatian started badly as he lost the opening game on his serve and was unable to recover in the first set, but he broke in the second set to level the match and twice broke in the third to book a second-round meeting with Uzbekistan's Denis Istomin.
Sam Querrey, who was originally set to face injured fifth seed Vasek Pospisil, wasted a glorious opportunity as he lost out 6-4 3-6 4-6 to lucky loser Albert Ramos.
The American broke his opponent's serve in the final game of the first set to assume control of the match, but found the Spaniard in inspired form thereafter as the world number 85 won all of his service games and broke Querrey on three occasions.
Ramos now faces a last-16 clash with Radek Stepanek - ranked one place higher than Querrey - after the Czech battled to a 6-7 (6-8) 7-6 (7-5) 6-2 against wildcard Sam Groth.
In the day's other first-round encounters, Nicolas Mahut claimed a 7-6 (7-2) 7-5 victory over Ryan Harrison, qualifier Sergiy Stakhovsky won 6-3 6-4 against Carlos Berlocq, wildcard Marinko Matosevic made the most of his home advantage to triumph 6-2 4-6 6-3 over Florian Mayer, and Edouard Roger-Vasselin retired after going one set down to Alexandr Dolgopolov.
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