Hambantota - Avishka Fernando and Kusal Mendis hit centuries as Sri Lanka thrashed the West Indies by 161 runs in the second one-day international to clinch the series on Wednesday.
"The way Kusal and Avishka batted. The intensity is what I'm expecting from the boys. Be confident and play their natural game," skipper Dimuth Karunaratne said after the win.
Mendis got one reprieve on two when West Indies skipper Kieron Pollard dropped a simple chance at first slip off Jason Holder. He went on to score his second one-day hundred.
Cottrell dented Sri Lanka's middle-order with the wickets of Thisara Perera, for 36, and Dhananjaya de Silva, for 12, to end with figures of 4-67.
Ambris, who was dropped by Sandakan on seven off paceman Nuwan Pradeep, was the first to depart after being run out for 17.
A floodlight failure delayed Sri Lanka's victory march by 15 minutes as Pradeep, who took two wickets, and Sandakan combined to wipe off the tail.