Defending champions Central Coast Mariners reached the semi-finals of Australia's A-League with a 1-0 win over Adelaide United in the elimination play-off in Gosford on Saturday.

A Bernie Ibini goal in the 67th minute was enough to seal victory for the Mariners to end Adelaide's title run.

Central Coast will now play Western Sydney Wanderers at Sydney's Parramatta Stadium next Saturday for the right to play in the A-League final on May 4.

Melbourne Victory will face Brisbane Roar in the other semi-final in Brisbane on Sunday April 27.

Ibini's strike continued the Mariners' formidable record at home against the Reds, who have not won in Gosford since January 2009.

The Mariners had little time to celebrate, however, with the side to board a flight to Japan early Sunday for their crucial AFC Champions League game against Sanfrecce Hiroshima on Wednesday.

Italian great Alessandro Del Piero may have played his last game for Sydney FC after they bowed out of the title race to Melbourne Victory on Friday.

Brazilian Gui Finkler knocked Del Piero's Sydney FC out with a stoppage time goal in a 2-1 win in Melbourne.

A pulsating game, in which Archie Thompson opened the scoring for the home side before Seb Ryall's first-half equaliser, was fizzling out until Adama Traore's cross found the Brazilian unmarked in the penalty area.

His volley past Vedran Janjetovic was decisive, extending Victory's season by at least one game - and giving two Sydney FC men uncertain futures.

Frank Farina's coaching tenure will be under scrutiny, while fans will be wondering whether they have seen the last of Del Piero.

Del Piero, who turns 40 in November, said he was looking forward to a rest after his second season in the A-League and was talking to Sydney FC officials about his future.