Hand Review

Against the UTG+1 open I would most likely just call in position. ATs has decent playabillity and isn't strong enough to 3bet for value and is to strong to 3 bet bluff with I think.

Cheers,
SDK1987

According to the MSS strategy this is a 3 bet against a mid position raiser.
PokerStars - $0.02 NL - Holdem - 8 players
Hand converted by PokerTracker 4

Hero (BTN): 38.5 BB
SB: 148 BB (VPIP: 62.50, PFR: 23.81, 3Bet Preflop: 20.00, Hands: 25)
BB: 34 BB (VPIP: 22.88, PFR: 8.55, 3Bet Preflop: 0.00, Hands: 156)
UTG: 102.5 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 11)
UTG+1: 196.5 BB (VPIP: 35.44, PFR: 17.07, 3Bet Preflop: 7.25, Hands: 545)
MP: 36 BB (VPIP: 19.23, PFR: 8.00, 3Bet Preflop: 0.00, Hands: 26)
MP+1: 152.5 BB (VPIP: 23.25, PFR: 13.60, 3Bet Preflop: 4.82, Hands: 228)
CO: 100 BB (VPIP: 18.25, PFR: 11.23, 3Bet Preflop: 7.29, Hands: 288)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has A♥ T♥

fold, UTG+1 raises to 2.5 BB, fold, fold, fold, Hero raises to 8 BB, fold, fold, UTG+1 calls 5.5 BB

Flop: (17.5 BB, 2 players) 8♥ 4♦ 5♠
UTG+1 checks, Hero checks

Turn: (17.5 BB, 2 players) 9♥
UTG+1 checks, Hero?

Without any info on villains fold to Cbet stats it's close to Cbet flop or not. As played I would go for a free river card with the nut flush draw.

PokerStars - $0.02 NL - Holdem - 8 players
Hand converted by PokerTracker 4

Hero (BTN): 38.5 BB
SB: 148 BB (VPIP: 62.50, PFR: 23.81, 3Bet Preflop: 20.00, Hands: 25)
BB: 34 BB (VPIP: 22.88, PFR: 8.55, 3Bet Preflop: 0.00, Hands: 156)
UTG: 102.5 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 11)
UTG+1: 196.5 BB (VPIP: 35.44, PFR: 17.07, 3Bet Preflop: 7.25, Hands: 545)
MP: 36 BB (VPIP: 19.23, PFR: 8.00, 3Bet Preflop: 0.00, Hands: 26)
MP+1: 152.5 BB (VPIP: 23.25, PFR: 13.60, 3Bet Preflop: 4.82, Hands: 228)
CO: 100 BB (VPIP: 18.25, PFR: 11.23, 3Bet Preflop: 7.29, Hands: 288)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has A♥ T♥

fold, UTG+1 raises to 2.5 BB, fold, fold, fold, Hero raises to 8 BB, fold, fold, UTG+1 calls 5.5 BB

Flop: (17.5 BB, 2 players) 8♥ 4♦ 5♠
UTG+1 checks, Hero checks

Turn: (17.5 BB, 2 players) 9♥
UTG+1 checks, Hero checks

River: (17.5 BB, 2 players) K♠
UTG+1 checks, Hero checks

Seems allright played at most part. It's also interesting what your own though process was during the hand.