The 27-year-old British climber Adam Yates of Mitchelton-Scott is also making his 2020 debut and looks favourite to win in a competitive field after his stunning attack from 6km out at the end of a warm day with temperatures passing 30C.
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2020 UAE Tour: Caleb Ewan seals second stage race victory
The 25-year-old Ewan, who also won two stages on the Tour Down Under earlier this year, edged out Irishman Sam Bennett on the up-hill climb at the finish to take the win at Hatta Dam for a second straight year.
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In pictures: Pascal Ackermann wins Dubai Silicon Oasis stage of UAE Tour 2020
The German cycling sensation started his sprint 300 metres out and that decision was vindicated as he held off Caleb Ewan to take his second win of the year