COLOMBO (AFP) - Half-centuries from Aaron Finch and skipper Steve Smith helped Australia pull off a tricky chase to defeat a resilient Sri Lanka by three wickets in the first one-day international in Colombo on Sunday. Australia, who suffered their first series whitewash against the hosts in the three Tests, chased down 228 in 46.5 overs at the R. Premadasa Stadium to lead the five-match ODI series 1-0.