Chelsea moved to within one win of the Premier League title and confirmed Middlesbrough's relegation with a consummate performance and emphatic victory at Stamford Bridge. Antonio Conte's side can become champions with victory against West Bromwich Albion at The Hawthorns on Friday night while Middlesbrough must contemplate a future back in the Championship after they were swept aside on Monday. The Blues had already created a succession of chances before Diego Costa turned in man of the match Cesc Fabregas' pass after 23 minutes.