Steve Johnson defeated Di Wu 6-1 6-3 in the Roland Garros qualifying round of 64 on clay.
Johnson S. took it in straight sets.
Steve Johnson beat Di Wu 6-1 6-3. Umpiry, "Steve Johnson vs Di Wu — Roland Garros Qualifying Round of 64", https://umpiry.com/match/2013-05-22/johnson-vs-wu-roland-garros-q64?utm_source=cite (as of 22 May 2013).