  In this paper, we consider the Cauchy problem to the 3D MHD equations. We
show that the Serrin--type conditions imposed on one component of the velocity
$u_{3}$ and one component of magnetic fields $b_{3}$ with $$ u_{3} \in
L^{p_{0},1}(-1,0;L^{q_{0}}(B(2))),\ b_{3} \in
L^{p_{1},1}(-1,0;L^{q_{1}}(B(2))), $$
$\frac{2}{p_{0}}+\frac{3}{q_{0}}=\frac{2}{p_{1}}+\frac{3}{q_{1}}=1$ and
$3<q_{0},q_{1}<+\infty$ imply that the suitable weak solution is regular at
$(0,0)$. The proof is based on the new local energy estimates introduced by
Chae-Wolf (Arch. Ration. Mech. Anal. 2021) and Wang-Wu-Zhang
(arXiv:2005.11906).
