No as its not a stat to do with results. The first number is the amount of wickets taken by the bowler and the second number is the number of runs given away in taking those wickets, so the best figures would be the most wickets for the least amount of runs. with the stats that are in there at the moment the order would be...
6-5
4-13
3-6
2-7
2-15
but these could change as the season progresses.