Question: Which tennis player, Kevin Ullyett or Jonathan Marray, competed on the singles tour, reaching world no. 215 in April 2005, but was unable to continue his singles career, in part due to injuries?
Sentence (from "Jonathan Marray"): Marray is a former top 20 doubles player, reaching a career high of world no. 15 in January 2013, mainly due to more regular appearances on the ATP World Tour, following his victory at Wimbledon 2012.
Relevant evidence: No