Scottish Cup: Stephen Kenny's Dunfermline put their league woes behind them to claim the scalp of Tennent's Scottish Cup holders Hearts after Scott Wilson headed home an injury-time winner.
The towering centre-half headed man-of-the-match Adam Hammill's free-kick into the goal from close range.
The Pars, bottom of the SPL, were hanging on by the skin of their teeth at one stage in the second half as Roman Bednar, Michal Pospisil and Andy Driver had all gone close for the visitors but held on to book their place in Sunday's quarter-final draw.
Hearts' city rivals Hibernian took a step closer to their second cup final of the season with a 3-1 victory over Gretna at Easter Road.
An own goal from Gretna goalkeeper Greg Fleming was sandwiched between goals from Rob Jones and Abdessalam Benjelloun, as Hibs booked their place in the quarter-finals.
The consolation strike came courtesy of Matthew Berkeley with 10 minutes to go.
First Division St Johnstone surged through with a comprehensive 3-0 away win over Falkirk.
Goals by Martin Hardie and Kevin James, both following Paul Sheerin corners, gave the Perth side a well-deserved half-time lead over the lacklustre Bairns.
A Peter MacDonald strike after the break sealed the victory for the Saints who, after a shaky start, were more than a match for their SPL opponents.
A wonderful strike by Russell Duncan saw Inverness advance past Dundee United to reach the last eight for the first time since 2004.
The only goal of the game came in the 16th minute, when Duncan took possession of the ball 25 yards from goal, before dispatching a brilliant drive into the top right-hand corner of Derek Stillie's goal.
Rory McAllister should have doubled the Highlanders' advantage but sent a header over from six yards out, while Caley Thistle goalkeeper Michael Fraser did well to parry a powerful injury-time shot from Barry Robson.
Rangers target Scott McDonald proved he had no hangover from his midweek transfer disappointment as Motherwell eased through with a 2-0 win over Morton.
The striker had a hand in Brian Kerr's early opener and put the game beyond the Second Division leaders before the interval.
Morton had decent spells of possession but lacked a cutting edge against a below-par home side.
Deveronvale, the only non-league side left in the competition, saw their hopes ended as a 31st minute strike from James Gibson gave visitors Partick a narrow 1-0 win.
And in the only other game not involving SPL sides, First Division Queen of the South ran out 2-0 winners over Second Division Cowdenbeath thanks to goals from Stephen Dobbie (penalty 29) and Jamie Adams 54.
