(FR) 99 pre vs maniac

Villain fold to 3 bet was 38% (3/8).
Questions below

$0.05 NL - Holdem - 7 players

BB: 190.6 BB (VPIP: 13.33, PFR: 10.00, 3Bet Preflop: 7.69, Hands: 31)
UTG: 305.4 BB (VPIP: 22.22, PFR: 11.11, 3Bet Preflop: 0.00, Hands: 27)
UTG+1: 21 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 16)
MP: 135.2 BB (VPIP: 58.33, PFR: 41.67, 3Bet Preflop: 0.00, Hands: 37)
CO: 110 BB (VPIP: 37.93, PFR: 34.48, 3Bet Preflop: 36.84, Hands: 29)
Hero (BTN): 101.6 BB
SB: 99 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: -, Hands: 1)

SB posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has 9♣ 9♠

fold, fold, MP raises to 3 BB, fold, Hero raises to 9 BB, fold, fold, MP calls 6 BB
Questions:

Flop: (19.4 BB, 2 players) J♦ 8♥ Q♠
MP bets 19.4 BB, fold