Soccer-Olympiakos win shootout 15-14 to clinch Greek double

* Olympiakos lift Greek Cup after penalty shootout

* Victory over AEK secures their 14th domestic double

* Two Olympiakos players sent off in extra time

By Barney Spender

ATHENS, May 2 (Reuters) - Greek champions Olympiakos Piraeus won a gripping penalty shootout 15-14 against AEK Athens in the Greek Cup Final to clinch the domestic double on Saturday.

Former Greece goalkeeper Antonis Nikopolidis fired home the winning penalty after saving Agustin Pelletieri's effort during the second round of spot kicks at the Olympic Stadium. Olympiakos won a 14th double and their fourth in five years after the match ended at 3-3 in 90 minutes and 4-4 after extra time with two of their players sent off in the extra period.

Olympiakos looked to be heading for defeat when they trailed 3-2 in normal time but English forward Matt Derbyshire equalised six minutes into added time to ensure an extra half-hour.

AEK had taken a 2-0 lead with Ismael Blanco's double after eight minutes but Olympiakos recovered as on-loan Blackburn Rovers striker Derbyshire pulled a goal back just after halftime and Dudu Cearense grabbed an equaliser in the 70th minute.