Knapper and partner Samuel Tolchard took on Namibia in the pairs competition at Kelvingrove Lawn Bowls Centre on Monday.
But their chances of a medal took a hit when Knapper picked up a back injury in the early stages of the game.
However, Taplow-born Knapper played through the pain barrier to secure a bronze.
He and Tolchard led Namibia 19-12 after 17 tough ends before their opponents conceded the game with one end still to play.
It was the start of a memorable day for Tilehurst after former Tilehurst Swimming Club star, Adam Barrett, also won bronze in the 100m butterfly last night.
The 21-year-old put in a strong finish in Glasgow to claim third place behind Singapore’s Joseph Schooling and Sough African winner Chad le Clos, who set a new Commonwealth Games record time of 51.29secs.
Barrett had already won bronze in the men’s 4x100m freestyle alongside Adam Brown, James Disney-May and Ben Proud at the weekend.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here