The Hoyas trailed 29-15 at the half, but made eight of their nine three pointers in the second half to force the extra period.
Logan McIntosh scored eight of his 28 points in overtime to help McEachern (19-4, 11-3) pull out the victory. Freddy Brown finished with 11 points and Lawrence Castor added seven points and nine rebounds.
Justice Morgan scored 27 points to lead Harrison.
Kennesaw Mountain 49, North Cobb 48: Kennesaw Mountain built a late fourth quarter lead before holding off a North Cobb comeback attempt in a Region 4AAAAAA game.
Nigel Hayes and Andrew Jimenez both had 11 points to lead the Mustangs (10-12, 5-10).
Micah Woodward had 16 points to lead the Warriors.
Walton 56, Cherokee 48: Walton led by 19 points midway through the third quarter before picking up the Region 5AAAAAA road win.
Elijah Weems had 22 points for the Raiders (20-3, 11-2). Nick Wells had 10 and Juanye Colon made three 3s in the second quarter and finished with nine points.
Walton hosts Wheeler on Friday.
Sprayberry 70, Kell 50: Sprayberry completed an undefeated Region 7AAAAA slate following the win at home.
The Yellow Jackets (21-4, 14-0) trailed 29-23 at halftime, but outscored the Longhorns 47-21 in the second half.
Armel Potter made six 3s in the third quarter and finished with 30 points and six assists to lead Sprayberry. Nkem Ojeh had eight points, a career-best 17 rebounds and six blocked shots. Maurion Skrine and Wayne Jackson each had nine for the Yellow Jackets, who had 13 three-pointers.
Qua Alexander had 11 for Kell.
Sprayberry earned the No. 1 seed and a first round bye in the Region 7AAAAA tournament at Sequoyah. The Yellow Jackets will play Wednesday against a to be determined opponent.
Whitefield Academy 69, King’s Ridge 45: Norman Harris had 17 points and six rebounds for the Wolfpack in the Region 6A win on the road. Eric Lockett added 13 points and nine assists.
Whitefield took a 41-19 lead at the half and rested its starters for most of the second half.
Whitefield (18-5, 12-1) has now won 12 straight.
McEachern 80, Harrison 47: Caliya Robinson had a triple-double and then some to lead the Lady Indians to a Region 4AAAAAA victory.
Robinson finished with 18 points, 16 rebounds, 12 blocks and then added five assists and five steals to complete the performance.
Taylor Gordon scored 10 of her 15 points in the first quarter when McEachern (20-2, 14-0) jumped to a 27-9 lead.
Te’a Cooper had 17 points, six assists and four steals, while Jada Lewis finished with 12 points.
Sydne Wiggins led Harrison with 14 points.
The Lady Indians will host Campbell on Friday.
Lassiter 41, Milton 30: The Lady Trojans got out to a commanding early lead and improved their region record back to .500.
Lassiter (11-12, 6-6 Region 5AAAAAA) led 18-3 after the first quarter and maintained its edge.
Maeve Vitale scored a team-high nine points, with Grace Keheley and Emilee Olsen each scoring eight. Olsen also had 11 rebounds.
Lassiter will travel to Roswell on Friday.
Hillgrove 63, Pebblebrook 19: Hillgrove’s Mackenzie Engram equaled Pebblebrook’s 15 first half points and Tene Thompson added 14 to help the Lady Hawks post the Region 4AAAAAA home victory.
Engram also had 11 rebounds for Hillgrove (20-3, 13-2), while Jaya Smith chipped in 12 points and 10 boards. Jalyn Reese added 10 points and nine assists.
Randy Brown scored all 9 of her points in the first half to lead Pebblebrook, which is at Marietta Friday.
Hillgrove ends its regular at Kennesaw Mountain Friday.
North Cobb 54, Kennesaw Mountain 23: North Cobb led 31-12 at halftime and outscored Kennesaw Mountain 18-1 in the third quarter to pick up the Region 4AAAAAA win.
Kyrie’ Chandler scored her 1,000th career point and finished with 19 points and five steals for North Cobb (17-8, 8-8). Chantel Strahorn added 17 points, while Aniya Corley had six points and seven assists.
Kennesaw Mountain hosts Hillgrove Friday.
North Cobb ends its regular season and will participate in the Region 4AAAAAA tournament Monday at McEachern.
Kell 47, Sprayberry 38: After clinging to a 14-11 first quarter lead, Kell outscored Sprayberry 27-12 over the second and third periods to record the Region 7AAAAA road win.
Santavia Grant had 18 points for Kell (11-14, 9-5), while Onyx Henderson added 15 and Brittany Stocus had 11 rebounds.
Jada Richardson had 11 for Sprayberry, which completed its regular season and will await word on its seeding for Saturday’s region tournament at Sequoyah.
Kell ended the season as the No. 2 team from its subregion. The Lady Longhorns got a first round bye and advanced to play Northview Tuesday with the winner qualifying for the state tournament.
The Region 7AAAAA tournament begins Saturday with first-round action at Sequoyah.