Indian duo Jyoti Randhawa and Jeev Milkha Singh and Australia's Richard Green were also successful.
BBC: McDowell missed out on the US Masters earlier this year
The 24-year-old finished two shots behind Jyoti Randhawa to be second in the Asian Tour event with a 15-under-par 265 at Laguna Phuket Golf Club.
BBC: Davies claims second in Thailand
Oosthuizen is bracked with American Jason Knutzon and India's Jyoti Randhawa.
CNN: STORY HIGHLIGHTS
Anthony Kim lies sixth on eight-under with Pat Perez a further shot back and Brian Gay on six-under with India's Jyoti Randhawa -- the only other non-American inside the top eight.
CNN: Prowling Tiger shares Champions lead
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