Shane Watson made South Africa pay for a dropped catch as he set up a five-wicket win for Australia in the first Twenty20 international at Newlands Thursday. The opener hit a rapid 52 off 39 balls, after being dropped at slip on 2, and World Cup-winning coach Gary Kirsten made a losing start in charge of his native South Africa. Watson's fireworks up front as he smashed six fours and two sixes saw the touring Aussies chase down South Africa's 146-7 – despite a late wobble – and strike first in their monthlong tour. JP Duminy had made 67 off 53 balls to rescue South Africa's innings after a shaky start, but teenage fast bowler Pat Cummins took 3-25 on his debut for Australia – with all three wickets in an over – to peg the Proteas back in their final overs. Australia made an easy run chase difficult as it lost Watson and Shaun Marsh (25) in quick succession and then David Hussey late on and the match went to the last over. But needing six off six balls, Steven Smith lashed a square drive for four off the second delivery from Juan Theron and clipped a single through the legside for victory as Australia went to 147-5 and took the lead in the 2-match series. Scores: South Africa 146-7 (20 overs, JP Duminy 67, Colin Ingram 33, Pat Cummins 3-25). Australia 147-5 (19.3 overs, Shane Watson 52, Cameron White 28). Simmons' century sets up West Indies win In Dhaka, Lendl Simmons struck his maiden one-day century for West Indies which beat Bangladesh by 40 runs Thursday to take 1-0 lead in their three-match series. Simmons, playing in his 30th ODI, hit 122 as the tourists piled up a challenging 298 for four. The target proved too much for Bangladesh which was restricted to 258 for seven. Bangladesh never threatened to chase down their imposing target despite makeshift opener Naeem Islam scoring 52 and former skipper Shakib Al Hasan delivering some late blows to hit 67 not out.