SUNRISE — Aleksander Barkov scored a power-play goal with 18 seconds left in overtime, giving the Florida Panthers a 2-1 win over the St. Louis Blues on Friday night. Oskar Sundqvist got his third goal of the season for St. Louis, coming midway through the first period. Uvis Balinskis got his first of the season for Florida, with Barkov and Matthew Tkachuk assisting midway through the second. It stayed that way until the 65th minute, when Barkov ended it with his 10th goal of the season. The score followed an elite sequence where Barkov took possession of the puck among numerous Blues in the St.