British number three and top seed Dan Evans has pulled out of the Nottingham Open with an injury.
The 27-year-old's withdrawal comes after he was forced to retire from his against with Dustin Brown of Germany in the Surbiton Trophy on Saturday.
It is not yet known if Evans will be fit enough for Wimbledon, which starts on 3 July.
Meanwhile, fellow Briton Laura Robson went out in the first round at Nottingham, losing to Julia Boserup.
Robson, 23, received a wildcard for the grass-court event but was beaten 6-4 6-3 by the American world number 87 on Monday.
British number one Johanna Konta is the top seed in the women's draw and starts her campaign against compatriot Tara Moore on Tuesday, while Heather Watson faces American Alison Riske.
Elsewhere, Aljaz Bedene, the British number four, beat world number Denis Istomin of Uzbekistan 3-6 6-2 6-1 in the first round of the Ricoh Open in the Netherlands.