Britain's Andy Murray has pulled out of the Cincinnati Open as he bids to recover in time for the US Open.
The former world number one, 36, is still suffering from the abdominal strain that forced him to withdraw from the Canadian Open last week.
Murray travelled to Cincinnati and hoped to face Karen Khachanov but will now be replaced by a lucky loser.
Compatriot Dan Evans' first-round match was among those to be delayed by heavy rain in Cincinnati.
The British number two was scheduled to play Italy's Lorenzo Musetti in the first round on Monday but was unable to take the court.