British number two Kyle Edmund had an injury scare as he pushed world number three Grigor Dimitrov to three sets in the quarter-finals of the Brisbane International.
The 22-year-old needed treatment after he went over on his right ankle at 4-4 in the decider.
He was able to resume but went on to lose 6-3 6-7 (3-7) 6-4.
Edmund will now have the injury assessed before 2018's opening Grand Slam, which starts on 15 January.
With Andy Murray already out with a hip problem, Edmund is due to be the highest-ranked Briton in the men's singles.