SINGAPORE - American legend Andre Agassi said Novak Djokovic could be poised for a period of dominance in men’s tennis after showing he can rise “a level above” his peers without even trying too hard. Eight-time Grand Slam-winner Agassi said barring mishap, the world number one looked set for a long stay on top of the rankings after moving out in front this year. “I have to (tip) Djokovic heading into the next year or two,” Agassi told reporters at the International Premier Tennis League in Singapore late on Thursday.