Sachin Tendulkar has scored 15921 runs in Test matches, 18426 runs in ODIs and 5320 runs in T-20's.
From the above stated statement we can say that he has scored more runs in ___ matches.
ODI
We can compare three numbers by comparing their place values. So by comparing the place values, we can find that 18426 is greater than 15921 and 5320 being the lowest. So, Sachin has scored more runs in ODI matches.