1. Collision course: All four of the following teams won convincingly over the weekend, setting up a pair of Friday night blockbusters: No. 2 Wheaton Warrenville South (8-0) at No. 3 Naperville North (8-0) and No. 8 Glenbard West (8-0) at No. 7 Hinsdale Central (7-1).
2. It is difficult to replace a legend: The season after Gary Korhonen — the state’s winningest coach — retired, Richards lost to crosstown rival Oak Lawn for the first time in 34 years.
3. Divine Providence: The Celtics are making another late-season run, as evidenced by a rout of Bishop McNamara. A win over Guerin on Saturday makes Providence the most dangerous four-loss team in the playoffs.
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4. Warren is playing like a Top 20 team: The Blue Devils (7-1) continue to impress, this time with a 50-25 victory over Stevenson. Warren’s only loss was 35-21 to No. 1 Maine South.
5. It’s win or go home for Richards and Morris: Both need victories in their regular-season finales to keep their seasons alive. Richards has made the playoffs 23 years in a row and Morris 20 of the last 21 years.
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In the Web edition
*No. 1 Maine South survives scare from New Trier; Bryant Venson and Glenbard West remain unbeaten. Complete Week 8 coverage at chicagotribune.com/prepsplus
*Comment on Bob Sakamoto’s updated rankings Sunday evening at chicagotribune.com/sakamoto