Follow the money: Salary cap could spawn NHL trade frenzy

NHL

In this April 26, 2018, file photo, Washington Capitals defenseman Matt Niskanen (2) skates with the puck during the first period in Game 1 of an NHL second-round hockey playoff series against the Pittsburgh Penguins,in Washington. The Philadelphia Flyers have acquired defenseman Matt Niskanen from the Washington Capitals for defenseman Radko Gudas. This is the first significant move of the NHL offseason after the St. Louis Blues won the Stanley Cup less than 36 hours prior. (Nick Wass/AP, file)