Nick Kyrgios came out on top in a marathon tie-break to seal victory over Alexander Zverev in the battle of two Next Generation ATP stars at The Boodles on Friday.
Australia Kyrgios beat German teenager 6-3 7-6 (15-13) as the pair continued their preparations for Wimbledon on the grass on the penultimate day of the exhibition tournament at Stoke Park.
David Goffin beat Novak Djokovic on Wednesday, but Grigor Dimitrov succeeded where the world number one failed by beating the Belgian 6-4 6-7 (4-7) 12-10.
There were also victories for Nicolas Almagro and Viktor Troicki over Robin Haase and Juan Monaco respectively in Buckinghamshire.
Meanwhile, Roberto Bautista-Agut got the better of compatriot David Ferrer in the Tennis Classic at Hurlingham just three days before Wimbledon gets under way.