The thirteenth episode of Season 13, and the three hundredth episode of America's Got Talent overall, aired on August 21, 2018. It was the second of three Quarterfinals performance episodes and took place in the Dolby Theatre. 12 acts performed for 7 spots in the Semifinals.
|1. Makayla Phillips||Singer|
|2. Da RepubliK||Dance Group|
|3. Noah Guthrie||Singer/Guitarist|
|4. Yumbo Dump||Comedy Duo||*||*|
|5. Samuel J. Comroe||Stand-up Comedian|
|6. Voices of Hope Children's Choir||Choir|
|7. The Savitsky Cats||Cat Act|
|8. Glennis Grace||Singer|
|9. The Sacred Riana||Illusionist|
|10. Quin and Misha||Ballroom Dance Duo|
|11. Front Pictures||Multimedia Performance Act|
|12. Duo Transcend||Trapeze Duo|
*Simon and Mel originally buzzed Yumbo Dump, but later retracted their buzzers.
- This is the first time during the Live Shows that a judge retracted their buzz.
- AGT cut to a commercial break directly following The Sacred Riana's performance, before the judges commented. This caused a huge controversy on social media. It was later confirmed that the commercial was intentional by a leaked production document.