Ulster rider Jamie Hamilton is out of the Southern 100 on the Isle of Man following a spill at the Skerries 100 Irish road race meeting near Dublin.

The Wilson Craig Honda rider suffered a broken pelvis, a broken rib and a dislocated shoulder in the incident, which happened on the final lap of the feature Superbike race as he battled for the lead with Manx rider Dan Kneen.

Kneen was declared the winner of the red-flagged race on John Burrows' Cookstown B.E. Racing Suzuki ahead of Skerries man Michael Sweeney and Derek Sheils on the CD Racing Kawasaki.

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Hamilton maintained his brilliant form from the Bush meeting last weekend - where he won four times - as he began the day with a win in the Open race. His advantage at the line was one and a half seconds over Sheils, with Sweeney taking third.

William Dunlop made a successful return to racing following his fall in the Senior race at the Isle of Man TT, passing Derek McGee and Hamilton to take the lead of the Supersport race and pulling away to win with six seconds in hand on the Tyco Suzuki GSX-R600.

Dunlop didn't have the 1000cc TAS Racing Superbike at Skerries, but the Ballymoney man will be reunited with the machine for the Southern 100.

Derek McGee crashed out at Finnegan's Corner on the first lap of the Supertwin 650 race, which Hamilton went on to win by 13 seconds on Robbie Silvester's Kawasaki ER6 as he set a new lap record for the class.

Connor Behan from Cheshire finished as the runner-up on the KMR SGS International Kawasaki, with Czech rider Michal Dokoupil finishing on the podium in third.

The Irish road racing season continues this weekend with the 'Race of the South' at Walderstown in Co Meath.