Emma Raducanu has retired from the quarter-finals of the Korea Open with an apparent left foot injury, after losing the first set 6-1 against top seed Daria Kasatkina.
The Briton was bidding to reach her first semifinal above WTA 250 level since winning the 2021 US Open.
Kasatkina had not lost a set to Raducanu in two previous meetings, including a 6-2, 6-2 win in the Eastbourne grass-court quarterfinals three months ago.
Raducanu had moved into the quarter-finals of the Korea Open after beating Yue Yuan.
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