Chelsea put aside their struggles in the new year and looked like a renewed squad, stamping their class to record a 3-0 win over Crystal Palace in their English Premier League match at the Selhurst Park on Sunday.
Willian scored a 20-yard stunner in the second half after Oscar tapped in a Costa square to fire in the first goal of the evening.
Out-of-form Diego Costa found his touch and the drilled in third goal to put the match past Palace.
With this win, Chelsea have now recorded their first away win in the Premiership since August 2015.
Chelsea began the match placed 16th in the table but this, their third win in their last 11 league matches moved them up a couple of places on 23 points, 12 points behind fourth placed Tottenham Hotspur who are in action later at Everton.
While a top-four finish still appears unlikely, captain John Terry said the club is now moving in the right direction again having lost nine of their opening 15 games, having won the title by eight points in May.
"This was the Chelsea of last year, the football was first class and we kept the ball in tough conditions," captain John Terry told Sky Sports.
"A near year, a new start, we just have to keep winning games now. We are where we are, we knew as a group we had to get better and we have done so slowly and surely and today hopefully is not the last of it."
Manager Guus Hiddink is unbeaten since taking over on an interim basis following the sacking of Jose Mourinho last month, although the win at Palace was his first following draws with Watford and Manchester United over the Christmas programme.
On a rain-soaked evening, Palace, who could have gone fifth with a win, were without two of their most influential players in suspended playmaker Yohan Cabaye and injured winger Yannick Bolasie but more than matched the visitors for 25 minutes.
Frazier Campbell had a half chance but sliced wide and shortly afterwards Chelsea struck.
Cesc Fabregas, booed by Chelsea's fans in the wake of Mourinho's dismissal, split the Palace defence with a measured pass and Costa advanced on goal before unselfishly squaring the ball for Oscar to stroke home after 29 minutes.
Palace keeper Wayne Hennessey saved well from Cesar Azpilicueta soon afterwards as Chelsea began to pop the ball around confidently on the sodden turf.
Wilfried Zaha wasted Palace's only opening of the second half when he shot tamely at Thibaut Courtois and Chelsea extended their lead in spectacular fashion on the hour, Willian's ferocious rising drive from just outside the penalty area giving Hennessey no chance.
Six minutes later Costa capped a hard-working performance with a close-range third goal after Willian's shot was saved.
Chelsea's only concern was an injury to Eden Hazard who limped off midway through the first half after signalling to the bench.
