Merrick

In the novel Towards Zero, Merrick is a young tennis player. He plays against Nevile Strange at a tennis tournament in St. Loo.

Agatha Christie's Marple
In the 2007 ITV adaptation of the story, Merrick is an American tennis player and here he has the initials "P. J.". He plays and defeats Strange at the Wimbledon centre court and not at St. Loo. Merrick is portrayed by the real-world tennis player Greg Rusedski.