The Northern Irishman was playing his first event since last month’s Open Championship.
The soon-to-retire Serena Williams has emerged as Emma Raducanu's next challenge as the Briton prepares to defend her US Open title.
He will face Pablo Carreno Busta after the Spaniard defeated British qualifier Jack Draper in straight sets.
He will face Pablo Carreno Busta after the Spaniard defeated British qualifier Jack Draper in straight sets.