Spinner Harbhajan Singh has said there are no better openers than Shikhar Dhawan and Rohit Sharma in any format. "If Dhawan continues working on his fitness in...coming 2-3 years...he'll be unstoppable," Harbhajan added. Dhawan, who was ruled out of World Cup mid-tournament due to injury, had made his international comeback in limited overs series against West Indies in August.