Sam Welsford wowed the crowd winning both the men's omnium and scratch race titles in quick succession.

In the omnium, Welsford’s bunch racing pedigree was on display as he blitzed the field to finish on 148 points, 19 clear of fellow Australian Kelland O'Brien in the silver medal position.

New Zealand's Campbell Stewart rounded out the podium on 123 points.

A third-place finish in the scratch race before commanding performances in the tempo and elimination set Welsford up nicely heading in to the final points race.

"The omnium was really fun today," the 22-year-old, who previously won the omnium in 2016, said.

"It has been a while since I have raced on the track, so it was really good to get out there.

"I had good legs and rode smart and to my abilities, so I was pretty happy to get the win.

"The Oceanias are really good to see how you are going at the start of track season and I got a bit of a bunch focus at the World Cups, so it is really good for peace of mind and confidence to get the win."

Fresh from his omnium success, Welsford sprinted more than three bike lengths clear of the field to snare the scratch gold medal.

Compatriots Leigh Howard, the 2011 winner, and Cameron Scott completed the top three.

In the women’s scratch race, Australia’s Ashlee Ankudinoff secured her third gold medal of the Championships.

Ankudinoff, who won a pair of titles in the points race and team pursuit yesterday, outsprinted a strong field.

The all-Australia podium also included Annette Edmondson in second and Georgia Baker in third.

Ellesse Andrews, meanwhile, put New Zealand back on the top step of the podium as she claimed a maiden elite title by winning the individual pursuit.

The 2017 junior world champion, competing in just her third three kilometres individual pursuit, stormed to the title in 3 min 38.380sec in cool conditions.

She beat out Australia’s Maeve Plouffe, the runner-up in 3:41.993.

Third place went to New Zealand’s Nicole Shields, who also won bronze as an under-19 in 2016.

The time trials saw Australia’s Kaarle McCulloch claim her eighth Oceania title in the women’s 500 metres event and the aforementioned Scott take the men's 1km crown, ending the winning run of New Zealand’s Zac Williams. 

McCulloch stopped the clock for two laps of the track in 34.075 with New Zealand's Emma Cumming second in 34.243 and Olivia Podmore third in 34.609.

Scott added the elite title to his under-19 victory from 2014 after posting a time of 1:01.503.

The silver medal went to Australia’s Tylah Meunier in 1:02.031.

Three-time defending champion Williams had to settle for bronze in 1:02.073.

Action continues tomorrow in Adelaide.