Japanese tennis star Kei Nishikori had an Estoril Open wildcard on the table but said no as he wants to rest next week. Nishikori's manager Olivier Van Lindonk revealed. Nishikori last played at this week's Barcelona Open.

The world No. 22 was forced to retire his opener after just one set played. Spain's Guillermo Garcia Lopez won the first set of their second-round matchup when the Japanese retired after experiencing pain in his right wrist.

The 2014 US Open champion returned to tennis from a wrist surgery at the end of January. Nishikori played lots of tennis last week as he ended runner-up at the Monte Carlo Masters. The 28-year-old Japanese has no previous appearances in Portugal.

He will take a week off and prepare for the upcoming Masters 1000 events in Madrid and Rome. The Madrid Masters is due to be held from 6-13 May. Nishikori ended runner-up in Madrid and 2014 and twice lost in the semi-finals.

Also read: Dominic Thiem drops praise on promising Jaume Munar