Hand 1 - Villian is 32/18/1.03 over a small 87 sample range. I am thinking the range of hands that I am behind here is much larger than the range that I am ahead of and that it is time to let this go.

PokerStars No-Limit Hold'em, $0.25 BB (8 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($22.15)
Button ($24.65)
Hero ($22.85)
BB ($24.75)
UTG ($29.50)
UTG+1 ($14.35)
MP1 ($25)
MP2 ($26.50)

Preflop: Hero is SB with :Tc: :Td:.
UTG raises to $1, 3 folds, CO calls $1, 1 fold, Hero raises to $2.5, 1 fold, UTG calls $1.50, CO calls $1.50.

Flop: ($7.75) (3 players)
Hero bets $7, UTG folds, CO raises to $19.65, Hero ????

Hand 2 - Villian was 42/15/1.27 over 40 hands. His weak bet/call line had me perplexed by the river. I am thinking a call on the river is mandatory, but would appreciate input on bet sizes for earlier streets.

PokerStars No-Limit Hold'em, $0.25 BB (7 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver Cards)

CO ($10.40)
Button ($24.60)
SB ($14.10)
BB ($17.70)
Hero ($45.70)
MP1 ($35.80)
MP2 ($57.15)

Preflop: Hero is UTG with , .
Hero raises to $0.75, 4 folds, SB calls $0.65, 1 fold.

Flop: ($1.75) , , (2 players)
SB bets $0.75, Hero raises to $2, SB calls $1.25.

Turn: ($5.75) (2 players)
SB bets $1.25, Hero raises to $4.75, SB calls $3.50.

River: ($15.25) (2 players)
SB bets $3.75, Hero ???