Mourinho's side failed to turn their domination into more goals and things got edgy late on when Saville's shot evaded Gazzaniga who seemed slow to get down.
A 68th-minute penalty by Cristiano Ronaldo secured a 2-2 draw at Middlesbrough in their FA Cup quarter-final.
Middlesbrough are back in the Premier League after a 1-1 draw with 10-man Brighton & Hove Albion in their multi-million pound promotion decider on Saturday while Burnley sealed the Championship title with a 3-0 victory at Charlton Athletic.
Summary of sports events and persons who made news on Thursday.
Santi Cazorla scored a 94th-minute penalty as sub-par Arsenal beat Southampton on Saturday with Laurent Koscielny's overhead kick having earlier cancelled out Petr Cech's own goal.
