Novak Djokovic is currently sidelined with a right wrist injury picked up at last week's Monte Carlo Masters but announced the good news on his twitter account.
Kei Nishikori is making his first appearance of the season on clay in the Catalan capital and after struggling past Roberto Bautista Agut in three sets earlier in the week.
Seeded sixth this year, Maria Sharapova is aiming for a third straight title on the red clay of Stuttgart as the preparations for the French Open get fully underway.
Top-ranked Rafael Nadal registered a 7-6 (7/2), 6-4 win over Albert Ramos in the second round of Barcelona Open.
Andy Murray was awarded the ceremonial freedom of his Scottish home town.
The 55th-ranked Teymuraz Gabashvili rallied from 3-0 down before dominating David Ferrer on his favored clay to reach the last 16.
Somdev Devvarman, who has been enduring rough patch in singles, and Pavic won 6-4 6-4 against local wild card entrants Roberto Bautista Agut and Albert Montanes in their opening round match of the euro 2,127,035 clay court event.
Maria Sharapova was made to toil for her 100th win on clay court as she overcame Lucie Safarova 7-6, 6-7, 7-6 to enter the second round of Stuttgart WTA tournament.
Defending champion Rafael Nadal, who was knocked out of Monte Carlo Masters quarters, is looking to get his clay court season back on track.
Maria Sharapova beat Lucie Safarova 7-6, 6-7, 7-6 to register her her 100th clay victory and advance to the second round of Porsche Grand Prix.
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