In the NHL they have goalie tandem's. My team has Darcy Kuemper and Pavel Francouz, and I honestly think that's the best tandem in that league (although I thought the same thing about Philipp Grubauer and Pavel Francouz).
Same applies to my rugby league team. Our 6 & 7 as a tandem I wouldn't trade for any other in the league. Not a chance. Are they still the absolute best in their respective positions? Maybe, maybe not. As a duo though, they are ruthless, a well oiled machine. The word "chemistry" comes to mind.