The 2019 NCAA Men's Division I Basketball Tournament came close to having all of the top 4 seeds in each region make it to the Sweet Sixteen. Only 2 teams lower than a 4-seed made it to the Sweet Sixteen - Auburn (5-seed) and Oregon (12-seed).
Was there ever a Sweet Sixteen that had all 4 top seeds from each region, or one that came closer than the 2019 season?