Store it like the following −
var players = { 600 : 'Sachin', 300 : 'Brad', };
For key/ value pairs, we have used the above solution, since we wanted a one-to-one. We did this to use the key as a lookup key. You can also add more values like this −
var players = { 900 : 'Sachin', 300 : 'Brad', 700 : 'Steve', 200 : 'Rahul', 600 : 'Kevin', 500 : 'David', }