Joe Root smashed his first century of the series and 14th overall as England surged ahead on day four of the fifth and final Test against India at The Oval on Monday.Root, who has had a very mediocre series according to his standards, showed immense class to sign off from the series with a century to his name.The England captain pushed himself to No.4 in the last innings of the Southampton Test and persisted with the position in the last Test match as well and the move has worked wonders for him. Moeen Ali, who replaced Root at No.3 has seen off the new ball and taken the shine off it on all three occasions and Root has benefited immensely from that.Root’s innings was not flawless however. He was dropped twice by Ajinkya Rahane on 46 and later in his 90s by Cheteshwar Pujara, when he edged one off Mohammed Shami on 94 but he shook the nervousness aside and took a single off Ravindra Jadeja in the 80th over to reach the landmark.Also read – Alastair Cook becomes 5th player to score a century in first and last TestA special day as @root66 scores his first century since last summer!Scorecard/Videos: https://t.co/6erwzLEIKR#EngvInd #ThankYouChef pic.twitter.com/e9qL2FpsEiEngland Cricket (@englandcricket) September 10, 2018Root’s innings might come at a time where the series is not on line but his return to form will be a welcome sign for the Englishmen, who are all set to lose one of their key players in Alastair Cook after this Test.advertisementRoot and Cook have been the backbone of the English batting for the last few years and it was this pair again, which haunted the Indian bowlers on a pitch that had little turn but nothing major to trouble the likes of Cook and Root.The pair got together when Ali fell for 20 with the score on 65 and forged a partnership over 200 to take England’s lead past 300 as the Indian bowlers struggled to get a breakthrough.Also read – Alastair Cook touched by India’s gesture in farewell Test Joe Root and Alastair Cook shared a stand of over 200 runs for the third wicket (AP Photo)While Cook had the best moments of the day after reaching his 33rd Test ton and his last ever in international cricket, Root did the majority of the scoring. Not out on 29 at the end of Day 3, Root took the onus on himself to score runs quickly from the beginning of the day.Resuming the fourth day at 114/2, both the English batsmen looked in solid control. Cook, who was not out on 46 at stumps on day three reached his fifty early on the penultimate day of the Test match while Root reached the landmark in the 57th over with a boundary of Shami.After that, Root accelerated and got quick runs and went into lunch unbeaten on 92. He resumed the second session of the day nervously and was dropped by Pujara as well but Root hung in there and reached his 14th Test ton and celebrated wildly in joy as his family watched on.This was only the second three-figure score for Root in the second innings after 180 against Australia at Lord’s in 2013.