Champion Rafael Nadal's Wimbledon participation is still in the balance after his first outing on grass in 12 months ended in a loss to Australia's Lleyon Hewitt.
The world tennis number one has been troubled by tendinitis in his knees since being knocked out of the French Open in the fourth round last month.
Nadal struggled with his movement during the exhibition match in London and his coach and uncle
Toni Nadal said ther Spaniard was having trouble bending his knees.
The 23-year-old will decide whether to play at Wimbledon after taking part in a second exhibition match against Stanislas Wawrinka at the Hurlingham Club tomorrow.
