England's Joe Root vowed to improve after missing out on his 12th hundred on day one of the fifth and final Test against India, in Chennai.
The 25-year-old struck 88 in the tourists' 284-4 before falling to spinner Ravindra Jadeja - Moeen Ali leading the way thereafter with an unbeaten 120.
Root converted eight of his first 21 scores of fifty or more in Tests into centuries - that's 38 per cent - but only three of his last 17 (18 per cent), and told Sky Sports: "It's very frustrating.
"The amount of times this year when I've got into a good position and not been able to kick on - it's quite frustrating.
"Milestones don't really mean anything if you're not winning games; that's the crux of it. But if you're scoring big hundreds you're giving your side the best chance of winning.
"I've definitely got plenty to work on. I've had a good year in terms of runs but you always want more and you want to make sure you are making contributions that win you games.
"I was convinced I wasn't out today. It took me a while to come around to it because I'm desperate to do well when representing England.
"It's another occasion when I've not gone on and just missed out, so hopefully I can sort that out in the second innings."
Root - endorsed by Alastair Cook as the man to succeed him as England Test captain when the time comes to retire - said that continued speculation about his leadership potential is not putting him off his game.
"It's not been a distraction. I don't go out of my way to read it - you're going to see it if you're on Twitter, any other social media site or in the papers.
"I just want to play cricket and things will take care of themselves. Cookie's been a fantastic leader for England and I'm sure that if he wants to do it, he'll do it for a number of years.
"Let's just see what happens. Hopefully he does stay in the job. He's a great captain and a great leader of this group of players and he can take us forward."
Root was dismissed for 88 when caught behind from an under-edge when trying to sweep Jadeja, with the initial not-out verdict being overturned after a review.
The Yorkshireman was convinced at the time he had not hit the ball and admitted his reaction to being given out was "childish" before going on to praise team-mate Ali for his century.
"He worked out the conditions and gave himself a chance - I thought the way he constructed his innings was brilliant.
"It wasn't easy starting your innings but he expanded his game exceptionally well. He earned the right and the rewards at the back end of the day.
"It's really impressive to see him go about his cricket like that. He's gaining experience all the time, playing more and more Test cricket, and the added responsibility to his batting definitely helps him.
"We've seen over the course of this tour how he's risen to that responsibility - he's made two brilliant hundreds and a couple of very good fifties as well. Hopefully he can go on tomorrow and make a really big one."