it would depend on who the MTF member is i guess..
I'd root for both; cheer at good points, boo at unforced errors. In the end I'd be happy and sad. It's hard but managable (did it at the Rafa vs Dimitrov match in Rotterdam last year)
fave tennismatch ever?
Rafa Nadal, Grigor Dimitrov, Roger Federer, Adam Lambert
Sleep with my eyes open,
Dream when I'm dead,
Love who my heart's chosen,
conque what lies ahead