Ranchi, May 23 (PTI) Gurindervir Singh ran a sensational race to lower the men's 100m national record time to 10.09 seconds while Vishal TK became the first Indian to run 400m below 45 seconds on a historic second day of the National Senior Federation Competition here on Saturday. Gurindervir clocked Asia's second fastest time this season, while Vishal did even better as his 44.98 seconds effort is the continent's best so far this year. The 100m showdown between Gurindervir and previous national