You need to write both decimal places, even though the second number is a zero, to show that you rounded to two decimal places. Remember to look at the number after the one you're interested in.

There's a new record holder for the most accurate clock in the world. Researchers at the National Institute of Standards and ...

On the surface, it’s petty, but this masks a more serious point; that the de facto single decimal-place system for measuring 0-62mph times is now out of date.