(Reuters) - Top seed Dustin Johnson heads five players who control their own destiny as they chase the FedExCup and a $10 million bonus at the season-ending Tour Championship in Atlanta starting on Thursday. Johnson, fellow American Patrick Reed, Australians Adam Scott and Jason Day and Englishman Paul Casey will clinch the season-long FedExCup points race if they also win the Tour Championship at East Lake on Sunday. "I haven't won the Tour Championship or the FedExCup. More...