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#3 Chelsea grind out a win despite not being at their best
On paper, Chelsea's 2-0 victory suggests that they had a comfortable outing against Sheffield United. But that couldn't have been far from the truth.
On the overall balance of play, the Blades were arguably the better side on the night. The visitors might actually have taken something from the game but for their poor finishing in attack.
Chelsea struggled to get going in the first half. And with time running out, they showed a lack of controlled game-management, much to the chagrin of their manager.
Nevertheless, victory is all that matters in the game. And Thomas Tuchel will be pleased that his side secured their spot in the FA Cup last four.
#4 Christian Pulisic's produces an inspired performance
Christian Pulisic has been in and out of the Chelsea starting lineup since Thomas Tuchel has taken over.
The former Borussia Dortmund man impressed in his debut campaign with the Blues before a serious long-term injury halted his progress.
Since then, he has struggled to rediscover his best form. And his case has hardly been helped by Tuchel's change in formation, which favours wing-backs.
Nevertheless, the USA international was handed a rare start against Sheffield United, and Pulisic rose to the occasion. He was arguably the brightest spark in the Chelsea attack on the night.
The 22-year-old completed the most take-ons, won more fouls and had the most shots of all Chelsea players in the first half. Moreover, Sheffield United constantly hacked at Pulisic to take him out of his stride, which seemed to be the only way to stop the player.
Pulisic was eventually replaced by N'golo Kante in the 83rd minute, but his performance must have left a positive impressive on Tuchel.
#5 Hakim Ziyech's scores a second important goal in the space of five days
Hakim Ziyech's Chelsea career has been a stop-start one, owing to his injury issues and Tuchel's change in formations.
Nevertheless, Ziyech was handed a rare start against Atletico Madrid in midweek. and he made a mark on the game. Hakim Ziyech concluded a brilliant counterattack to score Chelsea's opener
Five days later, the former Ajax man started the FA Cup clash with Sheffield United on the bench but was introduced with 15 minutes to go. He once again stepped up to the plate by scoring the all-important second goal, which secured Chelsea's spot in the semi-final.
Ziyech's technique and ability were on full display, as he brought the ball under his spell from the air before placing a pristine finish into the bottom right corner.
Chelsea will hope the 28-year-old keeps his run going when he returns from the international break.
