BJ Watling brought up his 17th Test fifty to help New Zealand take a competitive lead on Day 3. © AFP A fighting half-century by wicketkeeper-batsman B.J. Watling helped New Zealand to take a highly competitive lead of 177 at stumps on day three in the first Test match against Sri Lanka in Galle on Friday. New Zealand, who trailed Sri Lanka by 18 runs in the first innings, finished on 195 for seven and a target around 200 could prove tricky for the hosts. Spinners have long ruled the roost at Galle and towards the tail end of the game they tend to become even more threatening.The highest successful run chase at the grounds is 99 by Sri Lanka against Pakistan in 2014 and armed with a three-pronged spin attack, New Zealand should be already feeling comfortable.It was a thrilling day’s Test match with both teams fighting tooth and nail for the initiative and at stumps on day three New Zealand emerged on top thanks to the efforts of Watling, who finished unbeaten on 63.New Zealand had slumped to 25 for three losing top batsmen Ross Taylor (3) and Kane Williamson (4) cheaply and at 124 for six with…