Sri Lanka's bowler Angelo Mathews bowls on South Arican batsman Jon-jon Smuts (not in picture) during the first T20 match between South Africa and Sri Lanka on January 20, 2017 at Supersport park in Centurion, South Africa. Pic/AFP

Johannesburg: Injured captain Angelo Mathews hit two sixes in the last over to hand Sri Lanka a series-levelling three-wicket win in the second Twenty20 international against South Africa yesterday. But the win came at a cost.