Del Potro downs Chardy to reach ATP Delray semis

Injury-nagged 2009 US Open champion Juan Martin Del Potro advanced to the ATP Delray Beach Open semi-finals by defeating French fifth seed Jeremy Chardy 6-2, 6-3. In his comeback event after sitting out for nearly a year, the 27-year-old Argentine wildcard entrant earned a Saturday berth against 61st-ranked Sam Querrey, who rallied to dispatch fellow American Tim Smyczek 6-7 (1/7), 7-6 (7/4), 6-4. Bulgarian fourth seed Grigor Dimitrov will face American Rajeev Ram in the other semi-final.