Grouping method of singles players in Shanghai Masters Cup

Divided into two groups, every four players are a group, eight seed players are determined by the score ranking of ATP tournament, the first seed player is divided into red group and the second seed player is in blue group. Seeds No.3 and No.4, No.5 and No.6, No.7 and No.8 will be drawn separately, and the first batch of seeds will be divided into red groups. Each player must play against three other players in the same group. The top two in each group advance to the semi-finals, cross-eliminated, and the winner enters the finals.