Hello and welcome to LIVE updates from Day One of the Davis Cup semi final between holders, Great Britain and Argentina at Glasgow's Commonwealth Arena. First up, it's the big one. World number two, Andy Murray against Juan Martin Del Potro. The players met as recently as the 2016 Olympic final where the Scot came through a gruelling four-hour+ war of attrition to claim a second successive gold medal. It promises to be a key battle in the tie and all gets underway from 1pm BST.