Myneni suffered cramps and spasms in his entire body during the energy-sapping second singles match on Friday under hot and humid conditions. Bopanna was forced to play a singles match in Davis Cup after four years but delivered a 3-6 6-4 6-4 win over left-hander Chung Hong to give India a 4-0 lead.
Not only Myneni but Koreans Yong-Kyu Lim and Seong Chan Hong also struggled to negotiate the conditions. They also suffered cramps.
"We are learning. It's a tactical call. The captain and coach will have to sit and understand and decide which players are required (for conditions). We need to focus on all these things," he said.
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 his 10th singles win in Davis Cup.
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"It took a while to get used to, not just the movement but also courts. I don't remember when was the last time I made backhand slice returns. I had to change my style. While returning I was hitting it in alleys, my instincts automatically drove me to hit in those alleys," he explained.
"I was serving too may double faults. He was up a set and a break. But once I got the break the momentum changed. I made him serve and volley which he was not comfortable with."
"It does not tempt me to play singles. Youngsters have to come out and play it in Davis Cup. I am not playing singles on then Tour any more. It's tough for me," he said.
Asked if he knew he will be required to play today, Bopanna said, "Till this morning, I did not know I am playing. Saketh came and said he can't walk. We had no other option."
Bopanna also said that he is trying to help Ramkumar plan his calender well so that he gets to practice with better players and play bigger tournaments to improve further in his career.