關於法網買票 - 網球 Tennis

請教各位有經驗的前輩
今年小弟有機會在法網舉辦期間待在當地
想買個兩張跟朋友前去朝聖

進入官網訂票後發現
OUTSIDE COURTS有10歐 跟20歐的價位
但從描述看不出來是差別在哪
請問有前輩能指點一下嗎
謝謝

官網描述如下:
For under 20s, a reduced rate is proposed:
€10 during the Qualifying (May 16th to 20th),
€10 or €12 during Perrier Legends' Trophy (May 31st to June 5th)

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