Stage Four headed out of Norwood on a windy day with those who crashed in the third stage all back to contest another day.
Team Sky's Greg Henderson was an early attacker but everything was back together as the race raced approached Checkers Hill which was the stage's only King Of The Mountains climb. Liquigas-Cannodale's Simone Ponzi was the first man over the hill as the race headed towards Strathalbyn with 94km to go.
Robbie McEwen took the first sprint of the day and with 82km, the first majot attack saw Cameron Meyer (Garmin-Cervelo), Laurens ten Dam (Rabobank), Blel Kadri (Ag2R-La Mondiale), Rob Rujigh & Thomas De Gendt (both Vacansoleil) and Matthew Wilson (Garmin-Cervelo) go 2.20 clear.
Thomas De Gendt took the second sprint of the day and was in the bench as the race got into Strathalbyn. However, he could not win the sprint again and it was Cameron Meyer who took the stage from Thomas De Gendt and Rabobank's Laurens ten Dam.
Ben Swift was seventh with Geraint Thomas 24th and Mark Cavendish 98th.
Cameron Mayer's victory also gave him the leaders Ocre Jersey.
The fifth stage is from McLaren Vale to Willunga and is 131km long.
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Race organisers Amaury Sport Organization (ASO) announced the selection of the 22 teams who will compete in thie year's Tour De France.
The first eighteen teams named are pro-teams and there are four French wildcard teams for the race which starts in Vendee on July 2nd.
Omega Pharma-Lotto (Bel), Quickstep Cycling Team (Bel) ,
Saxo Bank Sungard (Den), Euskaltel-Euskadi (Spa), Movistar Team (Spa),
Ag2R La Mondiale (Fra), Sky Procycling (GBr), Lampre - ISD (Ita)
Liquigas-Cannondale (Ita), Pro Team Astana (Kaz),
Team Leopard - Trek (Lux), Rabobank Cycling Team (NEd)
Vacansoleil-DCM Pro Cycling Team (Ned)
Katusha Team (Rus), BMC Racing Team (USA)
HTC-Highroad (USA), Team Garmin-Cervelo (USA)
Team Radioshack (USA),
Wlld Card teams - Cofidis, Le Credit En Ligne (Fra), Saur - Sojasun (Fra),
FDJ (Fra), Team Europcar (Fra)
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Coventry based cycling team MI race team headed by local legend Mick Ives are having their official launch on Saturday January 29th at the Coventry Transport Museum at 11.30am.
The launch will include a presentation by Eurosport commentator David Harman, who is a patron of the team.