Harrison Ridge showed the form that has taken him to No 9 age group ranking in United Kingdom by winning the LTA Grade 3 tournament at Bisham Abbey.
The reigning Oxfordshire under 14 champion, from Henley, found it tough going in the final against Oscar Glenister, from Bucks.
Ridge took the first set 6-1, then lost 5-7 before winning the tie-break 10-6.
Meanwhile, Cameron Murphy, from the host club, secured his first tournament win when he took the 14 & under boys title at Virgin Active Oxford’s Grade 5 event on Sunday.
Murphy beat Alex Honey, from Oxford, 5-4, 4-0 in the final.
Omar Noia-Rodriguez, from Abingdon, won the consolation event 5-4, 4-1 against Toby Warren, from Berkshire, in a tournament badly disrupted by the weather.
Oxford Sports extended their lead at the top of the Thames Valley Winter Lea-gue Premier Division to six points with a 7-1 victory at home to Norham Gardens.
Second-placed North Oxford lost ground when they won 5-3 in a high-quality match away to Thame.
Colston B’s 7-1 win against third-placed Norham B, ex-tended their lead at the top of Division 5 to 15 points.
In Ladies Division 2, Chol-sey B jumped into second and promotion contention with an 8-0 thumping of Goring B.
Premier Div: David Lloyd 2, Abingdon 6; Oxford Sports 7, Norham Gardens 1; Thame 3, North Oxford 5; Virgin Active 7, Oxford City 1; Witney 4, Portcullis 4.
Div 5: Appleton B 2, Faringdon B 6; Benson D 5, Abingdon D 3; Colston B 7, Norham Gardens B 1; Shiplake 8, Wantage 0.
Div 2: Goring B 0, Cholsey 8; Kingston Bagpuize 2, Witney 6; Kings Sutton 2, Mapledurham 6.
Div 3: Abingdon B 6, Wychwoods 2; Deddington 4, Faringdon B 4; Oxford Sports 6, Wantage 2; Watlington 1, Shiplake 7.