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**Portland's keeper putting up numbers worth knowing** • **Portland Thorns** — Mackenzie Arnold posting standout stat splits per Yahoo Sports • **Arnold (GK)** — save percentages and clean sheet data drawing attention this week • **Thorns** — Arnold's form a key factor in Portland's defensive stability this season • **Portland** — goalkeeper metrics suggest she's among the league's elite between the posts **What to watch:** How Arnold's numbers hold up as Thorns push deeper into the NWSL schedule. The lineup's set. Drop in.