By James Cormack Chelsea visit Middlesbrough on Tuesday night for the first leg of their Carabao Cup semi-final tie. The Blues seemed destined to exit the competition in the last eight before an erroneous Kieran Tripper header allowed Mykhailo Mudryk to equalise in stoppage time before Mauricio Pochettino’s side downed Newcastle on penalties. Middlesbrough, meanwhile, have enjoyed a fairly tame route into the semi-finals. Michael Carrick’s men have beaten Huddersfield, Exeter, Bradford and Port Vale to set up this tie. Chelsea made light work of middling Championship opposition in the FA Cup o…