MLB won't extend the pitch clock for the posteason –
MLB open to adding a few seconds to pitch clock in the postseason
A word of caution about the pitch clock - Bleed Cubbie Blue
The MLB pitch clock rocks: How it works and why it will be great for baseball
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MLB adopts first pitch clock, defensive shifts limits, larger bases for 2023 season
MLB approves two rules for 2023 - ESPN 98.1 FM - 850 AM WRUF
MLB 'will not extend the pitch clock for the postseason' as runs per game this season increase by seven per cent from 8.6 to 9.2
2023 World Baseball Classic Won't Use MLB Pitch Clock, Shift Limit During Tournament, News, Scores, Highlights, Stats, and Rumors
MLB rule changes for 2023: The shift, pitch clock, pickoffs, bigger bases, etc. - AS USA
Major League Baseball's new pitch clock could be a game saver - Chicago Sun-Times
Assessing the impact of MLB rules changes at halfway mark