UPDATED: Blackcaps captain Kane Williamson has won the toss and chose to bat first on his home ground at the Bay Oval in this afternoon's One Day International series opener against Sri Lanka.

Openers Martin Guptill and Colin Munro put on 23 before Munro fell for 13 to the bowling of Sri Lankan legend Lasith 'Slinger” Malinga.

After the eighth over Guptill and Williamson had taken the score to 54/1. In the process Guptill brought up his 6000^th run in international cricket.

A close to capacity crowd is enjoying the match under partly cloudy skies.

Kane Williamson turns a ball to leg.

A big crowd enjouying the match at Bay Oval.

MILESTONE! @Martyguptill brings up 6000 ODI runs and takes the NZ total past 50! Superb stuff