LIVERPOOL, England : Andy Robertson sprang to the defence of Liverpool teammate Trent Alexander-Arnold after some fans booed the right back during his side's 2-2 draw at home to Arsenal on Sunday. Alexander-Arnold, who came through the Liverpool ranks and has won a clutch of silverware including two Premier League titles, announced this week that he would leave on a free transfer when his contract is up at the end of the season. He came off the bench in the second half but was given a decidedly