British-record signing Alexander Isak scored as Liverpool moved closer to securing Champions League football next season but the 3-1 victory over Crystal Palace owed as much to third-choice goalkeeper Freddie Woodman . Isak, in only his fifth game back since fracturing a fibula at Tottenham in December, has naturally taken time to rediscover his sharpness after four months out. But his opening strike was an example of why the club spent £125million to sign him in from Newcastle last summer, displaying the sort of instinctive finishing which the team has lacked. However, at the other end of the scale the 29-year-old Woodman, on his full Premier League debut for the club, showed there is just as much value in free transfers with one brilliant save leading seconds later to Andy Robertson scoring Liverpool’s second. Florian Wirtz scoring in added time, his first since January, secured a third successive league win and moved Liverpool up to fourth, eight points clear of sixth-placed Brighton.…