Pat the cod fillets dry and season both sides with salt and black pepper.
Heat 2 tablespoons olive oil in a large skillet.
Add the cod and sear until lightly golden, then carefully turn and cook the second side.
Transfer the cod from the skillet.
Add the remaining olive oil as needed.
Add the garlic and crushed red pepper flakes.
Add the halved cherry tomatoes and cook until they begin to soften and release their juices.
Pour in the white wine.
Add the lemon juice, lemon zest, salt, sugar, and black pepper.
Stir in the fresh basil.
Return the cod fillets to the skillet.
Spoon the sauce over the cod and continue cooking until the fish reaches 145°F (63°C) in the center.
Taste the sauce and adjust the seasoning if needed.
Serve immediately with the tomato basil sauce spooned over the fish.