 Pari gbolohun ti o tẹle: Ni gbogbo akoko MLS 2017, Frei jẹrisi ara rẹ bi ọkan ninu awọn olutọju agbabọọlu ti o dara julọ lẹẹkansi: o bẹrẹ awọn ere 33 ni gbogbo akoko deede, ṣiṣe awọn ipamọ 84 ni ọdun ti ọdun fun 69.4 ogorun ipamọ ogorun, ati apapọ 1.09 awọn ibi-afẹde lodi si ere kan, lakoko ti o tun ṣakoso lati tọju awọn iwe 13 mimọ, diẹ sii ju eyikeyi olutọju agbabọọlu miiran lọ. Ni ikọlu ikọlu ikọlu, Frei ṣe awọn ifipamọ mẹrin nikan ni ọna si ipari MLS Cup, ṣugbọn o tọju awọn iwe mimọ mẹrin lẹsẹsẹ, bi Seattle ti de ipari laisi gbigba ibi-afẹde kan. Ní ọjọ 9 oṣù Kejìlá ọdún 2017, ó bẹrẹ iṣẹ ní : 2017 MLS Cup Final against his former club Toronto FC at BMO Field, a rematch of the previous seasons final; Toronto won the match 20 to complete an unprecedented treble of the MLS Cup, the Supporters Shield, and the Canadian Championship, but Frei drew praise in the media for his performance throughout the match, following a string of impressive saves to keep the score level at half time, and made nine stops overall within the first hour of play. 2017 MLS Cup Final lòdì sí ẹgbẹ agbábọọlù rẹ àtijọ Toronto FC ní pápá BMO Field, èyí tí ó jẹ àtúnṣe sí ìdíje ìdíje ìdíje O pari ni ipo kẹta ni MLS Goalkeeper of the Year Award, lẹyin Tim Melia ati Andre Blake. Ní ọdún tó tẹ lé e, ó gba ipò kejì nínú àmì ẹyẹ náà, Zack Steffen nìkan ló kù. 