However, Team Cooper recorded their first victory in the competition with a 4-2 win.
Cowan, who is nine months older than the next oldest player in the comp, former Magpies rugby winger Peter Durham, pointed out he is enjoying mixing it with some of the Bay's promising juniors: "Some of the youngsters learn tennis isn't all about top spin and pace."
In the absence of captain and unbeaten No1 Shane Wilson, who had a Christmas work function, Hughes and Smyth Unichem Pharmacy Team Wilson recorded their first loss when beaten 5-1 by Jeff Gray Land Rover Team Giddy. This loss leaves Team Wilson first-equal at the top of the table with Sainsbury Logan and Williams Team Curtis, who upset Shed 2 Team Donovan 4-2 in the other tie.
Team Wilson's No2 Oscar Stewart turned up injured from a hockey training session earlier in the day and was beaten 6-0, 6-0 in his singles by Mike Hunia and in his doubles match when he combined with Sam Biss to take on Craig Giddy and Guy Howett.
Team Donovan captain Luke Donovan joined Wilson and Giddy as the only unbeaten No1s in singles play when he accounted for Damon Curtis with a 6-4, 7-5 victory. Donovan's No3 Russell Broughton, who was unbeaten in singles and doubles during all four previous rounds, lost both of his matches on Saturday.
Promising junior Max Brewster beat Broughton 6-3, 4-6, 6-4 before Broughton and Kim Cooper were beaten 6-3, 7-6 in their doubles by Curtis and Chris Ryan.