Northern Ireland's Jonathan Rea has opened up a 91-point lead in the World Superbike Championship standings, despite being denied a third straight win in Portugal.

Rea, who triumphed in race one on Saturday ahead of countryman Chaz Davies, won Sunday's Superpole sprint race in Portimao before finishing second behind closest challenger Alvaro Bautista in race two.

Kawasaki's Rea took the chequered flag in Sunday's 10-lap sprint race, two seconds ahead of Bautista, who was runner-up.

But in race two, Spain's Bautista (Ducati) overcame a poor start and a shoulder injury to take the lead with 14 laps to go and Rea was unable to mount a challenge for another first-placed finish.

Rea, chasing a record fifth consecutive title, has won eight of the last 10 World Superbike races.

Bautista won the first 11 this season to lead Rea in the standings by 61 points but the Spaniard crashed out in four consecutive rounds and the Briton has taken full advantage.

Rea tops the table on 490 points ahead of Bautista (399), with Yamaha pair Alex Lowes (249) and Michael Van Der Mark (245) third and fourth respectively.