Asked to take court in place of Saketh Myneni, who is still recovering from his gruelling match on Friday, Bopanna laboured to a 3-6 6-4 6-4 win against Chung, who is ranked as low as 655 in the ATP rankings.
Bopanna last played a singles match in the Davis Cup in 2012 when he won the dead fifth rubber against Uzbekistan s Sarvar Ikramov.
It was 10th singles win for Bopanna in Davis Cup on Sunday and thankfully it was a dead rubber since India had sealed tie on Saturday itself by wining the doubles. Playing the dead fifth rubber, 217-ranked Ramkumar lost the close contest 3-6 6-4 6-7(2) in little over two hours to Lim, who is placed 409 rungs below the Indian.
Despite losing the tie 1-4 , the Koreans have to be credited for making life tough for the Indians. They were playing on an alien surface but fought their hearts out in the tie.
All Indian players performed a popular Bollywood number Bayee Wah , immediately after Lim closed the tie, much to the surprise and delight of the fans.
India will now make its third attempt to qualify for the elite 16-nation World Group. They await the results of the World Group matches to know the rival in the play-offs to be held in September.
India last played in World Group in 2011 when it lost the first round against Serbia. After that, they have lost play-offs twice against Serbia (in 2014, Bangalore) and Czech Republic (in 2015, New Delhi).
Army man Lim, who lost to Myneni, recovered remarkably from the spasm he suffered on Friday, and played clean tennis to beat Ramkumar. Lim broke Ramkumar in the fourth game and served out the opening set in the ninth game in which he also saved a break chance after the Indian had saved three set points.
Bopanna peppered Chung with aces, firing 27 in all in the one-hour 23-minute match. It was his big serve that rescued him as he struggled with precision in his ground strokes as he was covering the entire court in a match after a long time.
The Indian, struggling with his ground strokes, was broken early in the second set that put Chung ahead 3-0. However, a break in the seventh game brought Bopanna back in the match. Bopanna broke him in the fifth game and retained the lead to serve out the match with an ace.