FLt20 champions Hampshire will play Lancashire in the quarter-finals of this year's competition.
The tie will be played on August 8, with Nottinghamshire hosting Essex the next day at Trent Bridge.
Prior to Hampshire's encounter, Surrey, who were crowned the best second-placed side, will take on two-time finalists Somerset on August 6.
Northants and Durham will contest the fourth quarter-final.
A full list of the four quarter-finals can be found below:
Surrey vs. Somerset (Tuesday August 6, 16:15)
Northants vs. Durham (Tuesday August 6, 19:10)
Hampshire vs. Lancashire (Wednesday August 7, 19:10)
Nottinghamshire vs. Essex (Thursday August 8, 19:10)