RIO DE JANEIRO: World number two Carlos Alcaraz is to have tests on his ankle after sustaining an injury that forced him to retire from his Rio Open first-round match against Thiago Monteiro on Tuesday. Alcaraz needed medical attention after twisting his right ankle on the second point of the contest, but the 20-year-old returned to the court a little later with heavy strapping. He played through the pain and managed to break Brazilian Monteiro’s serve but retired after being broken in the next game as the match ended with the score at 1-1. “Tomorrow I’ll have a test for my ankle and let’s see if it’s something serious or not,” Alcaraz told reporters. “I felt bad. That was the first impression I had. I was feeling pain once I fell down, so I thought it was going to be difficult to continue if I was still having those feelings.